diff --git a/.vscode/settings.json b/.vscode/settings.json
index 182fde60..8e3d0f16 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -3,6 +3,18 @@
   "sonarlint.rules": {
     "css:S4662": {
       "level": "off"
+    },
+    "javascript:S6747": {
+      "level": "off"
+    },
+    "javascript:S7764": {
+      "level": "off"
+    },
+    "javascript:S6772": {
+      "level": "off"
+    },
+    "javascript:S3776": {
+      "level": "off"
     }
   }
 }
diff --git a/src/app/(dashboard)/dashboard/cli-tools/components/ClaudeToolCard.js b/src/app/(dashboard)/dashboard/cli-tools/components/ClaudeToolCard.js
index b15caf94..b145c700 100644
--- a/src/app/(dashboard)/dashboard/cli-tools/components/ClaudeToolCard.js
+++ b/src/app/(dashboard)/dashboard/cli-tools/components/ClaudeToolCard.js
@@ -186,7 +186,7 @@ export default function ClaudeToolCard({
       <div className="flex items-center justify-between hover:cursor-pointer" onClick={onToggle}>
         <div className="flex items-center gap-4">
           <div className="size-12 flex items-center justify-center">
-            <Image src="/providers/claude.png" alt={tool.name} width={40} height={40} className="size-12 object-contain rounded-xl" onError={(e) => { e.target.style.display = "none"; }} />
+            <Image src="/providers/claude.png" alt={tool.name} width={40} height={40} className="size-12 object-contain rounded-xl" style={{ width: "auto", height: "auto" }} onError={(e) => { e.target.style.display = "none"; }} />
           </div>
           <div>
             <div className="flex items-center gap-2">
diff --git a/src/app/(dashboard)/dashboard/cli-tools/components/CodexToolCard.js b/src/app/(dashboard)/dashboard/cli-tools/components/CodexToolCard.js
index fee7b342..5e7aa7a9 100644
--- a/src/app/(dashboard)/dashboard/cli-tools/components/CodexToolCard.js
+++ b/src/app/(dashboard)/dashboard/cli-tools/components/CodexToolCard.js
@@ -159,7 +159,7 @@ wire_api = "responses"
       <div className="flex items-center justify-between hover:cursor-pointer" onClick={onToggle}>
         <div className="flex items-center gap-4">
           <div className="size-12 flex items-center justify-center">
-            <Image src="/providers/codex.png" alt={tool.name} width={40} height={40} className="size-12 object-contain rounded-xl" onError={(e) => { e.target.style.display = "none"; }} />
+            <Image src="/providers/codex.png" alt={tool.name} width={40} height={40} className="size-12 object-contain rounded-xl" style={{ width: "auto", height: "auto" }} onError={(e) => { e.target.style.display = "none"; }} />
           </div>
           <div>
             <div className="flex items-center gap-2">
diff --git a/src/app/(dashboard)/dashboard/cli-tools/components/DefaultToolCard.js b/src/app/(dashboard)/dashboard/cli-tools/components/DefaultToolCard.js
index 8f945e45..172c2510 100644
--- a/src/app/(dashboard)/dashboard/cli-tools/components/DefaultToolCard.js
+++ b/src/app/(dashboard)/dashboard/cli-tools/components/DefaultToolCard.js
@@ -224,13 +224,14 @@ export default function DefaultToolCard({ toolId, tool, isExpanded, onToggle, ba
   const renderIcon = () => {
     if (tool.image) {
       return (
-        <Image 
-          src={tool.image} 
-          alt={tool.name} 
-          width={40} 
-          height={40} 
-          className="size-12 object-contain rounded-xl bg-gray-500" 
-          onError={(e) => { e.target.style.display = "none"; }} 
+        <Image
+          src={tool.image}
+          alt={tool.name}
+          width={40}
+          height={40}
+          className="size-12 object-contain rounded-xl bg-gray-500"
+          style={{ width: "auto", height: "auto" }}
+          onError={(e) => { e.target.style.display = "none"; }}
         />
       );
     }
@@ -238,13 +239,14 @@ export default function DefaultToolCard({ toolId, tool, isExpanded, onToggle, ba
       return <span className="material-symbols-outlined text-3xl" style={{ color: tool.color }}>{tool.icon}</span>;
     }
     return (
-      <Image 
-        src={`/providers/${toolId}.png`} 
-        alt={tool.name} 
-        width={40} 
-        height={40} 
-        className="size-10 object-contain rounded-xl" 
-        onError={(e) => { e.target.style.display = "none"; }} 
+      <Image
+        src={`/providers/${toolId}.png`}
+        alt={tool.name}
+        width={40}
+        height={40}
+        className="size-10 object-contain rounded-xl"
+        style={{ width: "auto", height: "auto" }}
+        onError={(e) => { e.target.style.display = "none"; }}
       />
     );
   };
diff --git a/src/app/(dashboard)/dashboard/providers/[id]/page.js b/src/app/(dashboard)/dashboard/providers/[id]/page.js
index d43667f7..b4bee0c5 100644
--- a/src/app/(dashboard)/dashboard/providers/[id]/page.js
+++ b/src/app/(dashboard)/dashboard/providers/[id]/page.js
@@ -1,13 +1,13 @@
 "use client";
 
-import { useState, useEffect, useMemo, useCallback } from "react";
+import { useState, useEffect, useCallback } from "react";
+import PropTypes from "prop-types";
 import { useParams } from "next/navigation";
 import Link from "next/link";
 import Image from "next/image";
 import { Card, Button, Badge, Input, Modal, CardSkeleton, OAuthModal, Toggle } from "@/shared/components";
 import { OAUTH_PROVIDERS, APIKEY_PROVIDERS, getProviderAlias } from "@/shared/constants/providers";
 import { getModelsByProviderId } from "@/shared/constants/models";
-import { PROVIDER_ENDPOINTS } from "@/shared/constants/config";
 import { useCopyToClipboard } from "@/shared/hooks/useCopyToClipboard";
 
 export default function ProviderDetailPage() {
@@ -193,6 +193,47 @@ export default function ProviderDetailPage() {
     }
   };
 
+  const renderModelsSection = () => {
+    if (providerInfo.passthroughModels) {
+      return (
+        <PassthroughModelsSection
+          providerAlias={providerAlias}
+          modelAliases={modelAliases}
+          copied={copied}
+          onCopy={copy}
+          onSetAlias={handleSetAlias}
+          onDeleteAlias={handleDeleteAlias}
+        />
+      );
+    }
+    if (models.length === 0) {
+      return <p className="text-sm text-text-muted">No models configured</p>;
+    }
+    return (
+      <div className="flex flex-wrap gap-3">
+        {models.map((model) => {
+          const fullModel = `${providerAlias}/${model.id}`;
+          const oldFormatModel = `${providerId}/${model.id}`;
+          const existingAlias = Object.entries(modelAliases).find(
+            ([, m]) => m === fullModel || m === oldFormatModel
+          )?.[0];
+          return (
+            <ModelRow
+              key={model.id}
+              model={model}
+              fullModel={fullModel}
+              alias={existingAlias}
+              copied={copied}
+              onCopy={copy}
+              onSetAlias={(alias) => handleSetAlias(model.id, alias)}
+              onDeleteAlias={() => handleDeleteAlias(existingAlias)}
+            />
+          );
+        })}
+      </div>
+    );
+  };
+
   if (!providerInfo) {
     return (
       <div className="text-center py-20">
@@ -235,13 +276,14 @@ export default function ProviderDetailPage() {
               width={48}
               height={48}
               className="object-contain rounded-lg"
+              style={{ width: "auto", height: "auto" }}
               onError={(e) => { e.currentTarget.style.display = "none"; }}
             />
           </div>
           <div>
             <h1 className="text-3xl font-semibold tracking-tight">{providerInfo.name}</h1>
             <p className="text-text-muted">
-              {connections.length} connection{connections.length !== 1 ? "s" : ""}
+              {connections.length} connection{connections.length === 1 ? "" : "s"}
             </p>
           </div>
         </div>
@@ -297,41 +339,7 @@ export default function ProviderDetailPage() {
         <h2 className="text-lg font-semibold mb-4">
           {providerInfo.passthroughModels ? "Model Aliases" : "Available Models"}
         </h2>
-        {providerInfo.passthroughModels ? (
-          <PassthroughModelsSection
-            providerAlias={providerAlias}
-            modelAliases={modelAliases}
-            copied={copied}
-            onCopy={copy}
-            onSetAlias={handleSetAlias}
-            onDeleteAlias={handleDeleteAlias}
-          />
-        ) : models.length === 0 ? (
-          <p className="text-sm text-text-muted">No models configured</p>
-        ) : (
-          <div className="flex flex-wrap gap-3">
-            {models.map((model) => {
-              const fullModel = `${providerAlias}/${model.id}`;
-              // Also check for old format (providerId/model) for backward compatibility
-              const oldFormatModel = `${providerId}/${model.id}`;
-              const existingAlias = Object.entries(modelAliases).find(
-                ([, m]) => m === fullModel || m === oldFormatModel
-              )?.[0];
-              return (
-                <ModelRow
-                  key={model.id}
-                  model={model}
-                  fullModel={fullModel}
-                  alias={existingAlias}
-                  copied={copied}
-                  onCopy={copy}
-                  onSetAlias={(alias) => handleSetAlias(model.id, alias)}
-                  onDeleteAlias={() => handleDeleteAlias(existingAlias)}
-                />
-              );
-            })}
-          </div>
-        )}
+        {renderModelsSection()}
 
       </Card>
 
@@ -377,6 +385,16 @@ function ModelRow({ model, fullModel, alias, copied, onCopy }) {
   );
 }
 
+ModelRow.propTypes = {
+  model: PropTypes.shape({
+    id: PropTypes.string.isRequired,
+  }).isRequired,
+  fullModel: PropTypes.string.isRequired,
+  alias: PropTypes.string,
+  copied: PropTypes.string,
+  onCopy: PropTypes.func.isRequired,
+};
+
 function PassthroughModelsSection({ providerAlias, modelAliases, copied, onCopy, onSetAlias, onDeleteAlias }) {
   const [newModel, setNewModel] = useState("");
   const [adding, setAdding] = useState(false);
@@ -429,8 +447,9 @@ function PassthroughModelsSection({ providerAlias, modelAliases, copied, onCopy,
       {/* Add new model */}
       <div className="flex items-end gap-2">
         <div className="flex-1">
-          <label className="text-xs text-text-muted mb-1 block">Model ID (from OpenRouter)</label>
+          <label htmlFor="new-model-input" className="text-xs text-text-muted mb-1 block">Model ID (from OpenRouter)</label>
           <input
+            id="new-model-input"
             type="text"
             value={newModel}
             onChange={(e) => setNewModel(e.target.value)}
@@ -463,14 +482,23 @@ function PassthroughModelsSection({ providerAlias, modelAliases, copied, onCopy,
   );
 }
 
+PassthroughModelsSection.propTypes = {
+  providerAlias: PropTypes.string.isRequired,
+  modelAliases: PropTypes.object.isRequired,
+  copied: PropTypes.string,
+  onCopy: PropTypes.func.isRequired,
+  onSetAlias: PropTypes.func.isRequired,
+  onDeleteAlias: PropTypes.func.isRequired,
+};
+
 function PassthroughModelRow({ modelId, fullModel, copied, onCopy, onDeleteAlias }) {
   return (
     <div className="flex items-center gap-3 p-3 rounded-lg border border-border hover:bg-sidebar/50">
       <span className="material-symbols-outlined text-base text-text-muted">smart_toy</span>
-      
+
       <div className="flex-1 min-w-0">
         <p className="text-sm font-medium truncate">{modelId}</p>
-        
+
         <div className="flex items-center gap-1 mt-1">
           <code className="text-xs text-text-muted font-mono bg-sidebar px-1.5 py-0.5 rounded">{fullModel}</code>
           <button
@@ -497,6 +525,14 @@ function PassthroughModelRow({ modelId, fullModel, copied, onCopy, onDeleteAlias
   );
 }
 
+PassthroughModelRow.propTypes = {
+  modelId: PropTypes.string.isRequired,
+  fullModel: PropTypes.string.isRequired,
+  copied: PropTypes.string,
+  onCopy: PropTypes.func.isRequired,
+  onDeleteAlias: PropTypes.func.isRequired,
+};
+
 function CooldownTimer({ until }) {
   const [remaining, setRemaining] = useState("");
 
@@ -533,6 +569,10 @@ function CooldownTimer({ until }) {
   );
 }
 
+CooldownTimer.propTypes = {
+  until: PropTypes.string.isRequired,
+};
+
 function ConnectionRow({ connection, isOAuth, isFirst, isLast, onMoveUp, onMoveDown, onToggleActive, onEdit, onDelete }) {
   const displayName = isOAuth
     ? connection.name || connection.email || connection.displayName || "OAuth Account"
@@ -568,8 +608,6 @@ function ConnectionRow({ connection, isOAuth, isFirst, isLast, onMoveUp, onMoveD
     return "default";
   };
 
-  const hasError = effectiveStatus === "error" || effectiveStatus === "expired" || effectiveStatus === "unavailable";
-
   return (
     <div className={`flex items-center justify-between p-3 rounded-lg border border-border hover:bg-sidebar/50 ${connection.isActive === false ? 'opacity-60' : ''}`}>
       <div className="flex items-center gap-3 flex-1 min-w-0">
@@ -615,9 +653,9 @@ function ConnectionRow({ connection, isOAuth, isFirst, isLast, onMoveUp, onMoveD
       <div className="flex items-center gap-2">
         <Toggle
           size="sm"
-          checked={connection.isActive !== false}
+          checked={connection.isActive ?? true}
           onChange={onToggleActive}
-          title={connection.isActive !== false ? "Disable connection" : "Enable connection"}
+          title={(connection.isActive ?? true) ? "Disable connection" : "Enable connection"}
         />
         <div className="flex gap-1 ml-1">
           <button onClick={onEdit} className="p-2 hover:bg-sidebar rounded">
@@ -632,6 +670,29 @@ function ConnectionRow({ connection, isOAuth, isFirst, isLast, onMoveUp, onMoveD
   );
 }
 
+ConnectionRow.propTypes = {
+  connection: PropTypes.shape({
+    id: PropTypes.string,
+    name: PropTypes.string,
+    email: PropTypes.string,
+    displayName: PropTypes.string,
+    rateLimitedUntil: PropTypes.string,
+    testStatus: PropTypes.string,
+    isActive: PropTypes.bool,
+    lastError: PropTypes.string,
+    priority: PropTypes.number,
+    globalPriority: PropTypes.number,
+  }).isRequired,
+  isOAuth: PropTypes.bool.isRequired,
+  isFirst: PropTypes.bool.isRequired,
+  isLast: PropTypes.bool.isRequired,
+  onMoveUp: PropTypes.func.isRequired,
+  onMoveDown: PropTypes.func.isRequired,
+  onToggleActive: PropTypes.func.isRequired,
+  onEdit: PropTypes.func.isRequired,
+  onDelete: PropTypes.func.isRequired,
+};
+
 function AddApiKeyModal({ isOpen, provider, onSave, onClose }) {
   const [formData, setFormData] = useState({
     name: "",
@@ -701,7 +762,7 @@ function AddApiKeyModal({ isOpen, provider, onSave, onClose }) {
           label="Priority"
           type="number"
           value={formData.priority}
-          onChange={(e) => setFormData({ ...formData, priority: parseInt(e.target.value) || 1 })}
+          onChange={(e) => setFormData({ ...formData, priority: Number.parseInt(e.target.value) || 1 })}
         />
         <div className="flex gap-2">
           <Button onClick={handleSubmit} fullWidth disabled={!formData.name || !formData.apiKey}>
@@ -716,6 +777,13 @@ function AddApiKeyModal({ isOpen, provider, onSave, onClose }) {
   );
 }
 
+AddApiKeyModal.propTypes = {
+  isOpen: PropTypes.bool.isRequired,
+  provider: PropTypes.string,
+  onSave: PropTypes.func.isRequired,
+  onClose: PropTypes.func.isRequired,
+};
+
 function EditConnectionModal({ isOpen, connection, onSave, onClose }) {
   const [formData, setFormData] = useState({
     name: "",
@@ -782,9 +850,9 @@ function EditConnectionModal({ isOpen, connection, onSave, onClose }) {
           label="Priority"
           type="number"
           value={formData.priority}
-          onChange={(e) => setFormData({ ...formData, priority: parseInt(e.target.value) || 1 })}
+          onChange={(e) => setFormData({ ...formData, priority: Number.parseInt(e.target.value) || 1 })}
         />
-        
+
         {/* Test Connection */}
         <div className="flex items-center gap-3">
           <Button onClick={handleTest} variant="secondary" disabled={testing}>
@@ -805,3 +873,17 @@ function EditConnectionModal({ isOpen, connection, onSave, onClose }) {
     </Modal>
   );
 }
+
+EditConnectionModal.propTypes = {
+  isOpen: PropTypes.bool.isRequired,
+  connection: PropTypes.shape({
+    id: PropTypes.string,
+    name: PropTypes.string,
+    email: PropTypes.string,
+    priority: PropTypes.number,
+    authType: PropTypes.string,
+    provider: PropTypes.string,
+  }),
+  onSave: PropTypes.func.isRequired,
+  onClose: PropTypes.func.isRequired,
+};
diff --git a/src/app/(dashboard)/dashboard/providers/page.js b/src/app/(dashboard)/dashboard/providers/page.js
index ebee4b41..a90f6127 100644
--- a/src/app/(dashboard)/dashboard/providers/page.js
+++ b/src/app/(dashboard)/dashboard/providers/page.js
@@ -2,11 +2,36 @@
 
 import { useState, useEffect } from "react";
 import Image from "next/image";
+import PropTypes from "prop-types";
 import { Card, CardSkeleton, Badge } from "@/shared/components";
 import { OAUTH_PROVIDERS, APIKEY_PROVIDERS } from "@/shared/constants/config";
 import Link from "next/link";
 import { getErrorCode, getRelativeTime } from "@/shared/utils";
 
+// Shared helper function to avoid code duplication between ProviderCard and ApiKeyProviderCard
+function getStatusDisplay(connected, error, errorCode) {
+  const parts = [];
+  if (connected > 0) {
+    parts.push(
+      <Badge key="connected" variant="success" size="sm" dot>
+        {connected} Connected
+      </Badge>
+    );
+  }
+  if (error > 0) {
+    const errText = errorCode ? `${error} Error (${errorCode})` : `${error} Error`;
+    parts.push(
+      <Badge key="error" variant="error" size="sm" dot>
+        {errText}
+      </Badge>
+    );
+  }
+  if (parts.length === 0) {
+    return <span className="text-text-muted">No connections</span>;
+  }
+  return parts;
+}
+
 export default function ProvidersPage() {
   const [connections, setConnections] = useState([]);
   const [loading, setLoading] = useState(true);
@@ -108,29 +133,6 @@ function ProviderCard({ providerId, provider, stats }) {
   const { connected, error, errorCode, errorTime } = stats;
   const [imgError, setImgError] = useState(false);
 
-  const getStatusDisplay = () => {
-    const parts = [];
-    if (connected > 0) {
-      parts.push(
-        <Badge key="connected" variant="success" size="sm" dot>
-          {connected} Connected
-        </Badge>
-      );
-    }
-    if (error > 0) {
-      const errText = errorCode ? `${error} Error (${errorCode})` : `${error} Error`;
-      parts.push(
-        <Badge key="error" variant="error" size="sm" dot>
-          {errText}
-        </Badge>
-      );
-    }
-    if (parts.length === 0) {
-      return <span className="text-text-muted">No connections</span>;
-    }
-    return parts;
-  };
-
   return (
     <Link href={`/dashboard/providers/${providerId}`}>
       <Card className="h-full hover:border-primary/50 transition-colors cursor-pointer">
@@ -140,28 +142,29 @@ function ProviderCard({ providerId, provider, stats }) {
               className="size-10 rounded-lg flex items-center justify-center"
               style={{ backgroundColor: `${provider.color}15` }}
             >
-              {!imgError ? (
-                <Image
-                  src={`/providers/${provider.id}.png`}
-                  alt={provider.name}
-                  width={40}
-                  height={40}
-                  className="object-contain rounded-lg"
-                  onError={() => setImgError(true)}
-                />
-              ) : (
+              {imgError ? (
                 <span
                   className="text-sm font-bold"
                   style={{ color: provider.color }}
                 >
                   {provider.textIcon || provider.id.slice(0, 2).toUpperCase()}
                 </span>
+              ) : (
+                <Image
+                  src={`/providers/${provider.id}.png`}
+                  alt={provider.name}
+                  width={40}
+                  height={40}
+                  className="object-contain rounded-lg"
+                  style={{ width: "auto", height: "auto" }}
+                  onError={() => setImgError(true)}
+                />
               )}
             </div>
             <div>
               <h3 className="font-semibold">{provider.name}</h3>
               <div className="flex items-center gap-2 text-xs flex-wrap">
-                {getStatusDisplay()}
+                {getStatusDisplay(connected, error, errorCode)}
                 {errorTime && <span className="text-text-muted">• {errorTime}</span>}
               </div>
             </div>
@@ -175,33 +178,26 @@ function ProviderCard({ providerId, provider, stats }) {
   );
 }
 
+ProviderCard.propTypes = {
+  providerId: PropTypes.string.isRequired,
+  provider: PropTypes.shape({
+    id: PropTypes.string.isRequired,
+    name: PropTypes.string.isRequired,
+    color: PropTypes.string,
+    textIcon: PropTypes.string,
+  }).isRequired,
+  stats: PropTypes.shape({
+    connected: PropTypes.number,
+    error: PropTypes.number,
+    errorCode: PropTypes.string,
+    errorTime: PropTypes.string,
+  }).isRequired,
+};
+
 // API Key providers - only use textIcon, no image
 function ApiKeyProviderCard({ providerId, provider, stats }) {
   const { connected, error, errorCode, errorTime } = stats;
 
-  const getStatusDisplay = () => {
-    const parts = [];
-    if (connected > 0) {
-      parts.push(
-        <Badge key="connected" variant="success" size="sm" dot>
-          {connected} Connected
-        </Badge>
-      );
-    }
-    if (error > 0) {
-      const errText = errorCode ? `${error} Error (${errorCode})` : `${error} Error`;
-      parts.push(
-        <Badge key="error" variant="error" size="sm" dot>
-          {errText}
-        </Badge>
-      );
-    }
-    if (parts.length === 0) {
-      return <span className="text-text-muted">No connections</span>;
-    }
-    return parts;
-  };
-
   return (
     <Link href={`/dashboard/providers/${providerId}`}>
       <Card className="h-full hover:border-primary/50 transition-colors cursor-pointer">
@@ -221,7 +217,7 @@ function ApiKeyProviderCard({ providerId, provider, stats }) {
             <div>
               <h3 className="font-semibold">{provider.name}</h3>
               <div className="flex items-center gap-2 text-xs flex-wrap">
-                {getStatusDisplay()}
+                {getStatusDisplay(connected, error, errorCode)}
                 {errorTime && <span className="text-text-muted">• {errorTime}</span>}
               </div>
             </div>
@@ -234,3 +230,19 @@ function ApiKeyProviderCard({ providerId, provider, stats }) {
     </Link>
   );
 }
+
+ApiKeyProviderCard.propTypes = {
+  providerId: PropTypes.string.isRequired,
+  provider: PropTypes.shape({
+    id: PropTypes.string.isRequired,
+    name: PropTypes.string.isRequired,
+    color: PropTypes.string,
+    textIcon: PropTypes.string,
+  }).isRequired,
+  stats: PropTypes.shape({
+    connected: PropTypes.number,
+    error: PropTypes.number,
+    errorCode: PropTypes.string,
+    errorTime: PropTypes.string,
+  }).isRequired,
+};
diff --git a/src/app/api/auth/login/route.js b/src/app/api/auth/login/route.js
index f6cbdb06..c095a83f 100644
--- a/src/app/api/auth/login/route.js
+++ b/src/app/api/auth/login/route.js
@@ -1,5 +1,5 @@
 import { NextResponse } from "next/server";
-import { getSettings, updateSettings } from "@/lib/localDb";
+import { getSettings } from "@/lib/localDb";
 import bcrypt from "bcryptjs";
 import { SignJWT } from "jose";
 import { cookies } from "next/headers";
@@ -17,12 +17,12 @@ export async function POST(request) {
     const storedHash = settings.password;
 
     let isValid = false;
-    if (!storedHash) {
+    if (storedHash) {
+      isValid = await bcrypt.compare(password, storedHash);
+    } else {
       // Use env var or default
       const initialPassword = process.env.INITIAL_PASSWORD || "123456";
       isValid = password === initialPassword;
-    } else {
-      isValid = await bcrypt.compare(password, storedHash);
     }
 
     if (isValid) {
diff --git a/src/app/landing/components/Navigation.js b/src/app/landing/components/Navigation.js
index e6887f12..ba552d63 100644
--- a/src/app/landing/components/Navigation.js
+++ b/src/app/landing/components/Navigation.js
@@ -10,12 +10,17 @@ export default function Navigation() {
     <nav className="fixed top-0 z-50 w-full bg-[#181411]/80 backdrop-blur-md border-b border-[#3a2f27]">
       <div className="max-w-7xl mx-auto px-6 h-16 flex items-center justify-between">
         {/* Logo */}
-        <div className="flex items-center gap-3 cursor-pointer" onClick={() => router.push("/")}>
+        <button
+          type="button"
+          className="flex items-center gap-3 cursor-pointer bg-transparent border-none p-0"
+          onClick={() => router.push("/")}
+          aria-label="Navigate to home"
+        >
           <div className="size-8 rounded bg-linear-to-br from-[#f97815] to-orange-700 flex items-center justify-center text-white">
             <span className="material-symbols-outlined text-[20px]">hub</span>
           </div>
           <h2 className="text-white text-xl font-bold tracking-tight">9Router</h2>
-        </div>
+        </button>
 
         {/* Desktop menu */}
         <div className="hidden md:flex items-center gap-8">
diff --git a/src/app/landing/page.js b/src/app/landing/page.js
index 0887505a..78b09050 100644
--- a/src/app/landing/page.js
+++ b/src/app/landing/page.js
@@ -1,4 +1,5 @@
 "use client";
+import { useRouter } from "next/navigation";
 import Navigation from "./components/Navigation";
 import HeroSection from "./components/HeroSection";
 import FlowAnimation from "./components/FlowAnimation";
@@ -8,6 +9,7 @@ import GetStarted from "./components/GetStarted";
 import Footer from "./components/Footer";
 
 export default function LandingPage() {
+  const router = useRouter();
   return (
     <div className="relative text-white font-sans overflow-x-hidden antialiased selection:bg-[#f97815] selection:text-white">
       {/* Animated Background */}
@@ -55,7 +57,7 @@ export default function LandingPage() {
             </p>
             <div className="flex flex-col sm:flex-row items-center justify-center gap-4">
               <button 
-                onClick={() => window.location.href = "/dashboard"}
+                onClick={() => router.push("/dashboard")}
                 className="w-full sm:w-auto h-14 px-10 rounded-lg bg-[#f97815] hover:bg-[#e0650a] text-[#181411] text-lg font-bold transition-all shadow-[0_0_20px_rgba(249,120,21,0.5)]"
               >
                 Start Free
diff --git a/src/lib/localDb.js b/src/lib/localDb.js
index 5f06aa58..17f0a425 100644
--- a/src/lib/localDb.js
+++ b/src/lib/localDb.js
@@ -1,9 +1,9 @@
 import { Low } from "lowdb";
 import { JSONFile } from "lowdb/node";
 import { v4 as uuidv4 } from "uuid";
-import path from "path";
-import os from "os";
-import fs from "fs";
+import path from "node:path";
+import os from "node:os";
+import fs from "node:fs";
 
 const isCloud = typeof caches !== 'undefined' || typeof caches === 'object';
 
@@ -601,7 +601,7 @@ export async function getPricingForModel(provider, model) {
   const pricing = await getPricing();
 
   // Try direct lookup
-  if (pricing[provider] && pricing[provider][model]) {
+  if (pricing[provider]?.[model]) {
     return pricing[provider][model];
   }
 
diff --git a/src/shared/components/Header.js b/src/shared/components/Header.js
index 8d1e91b5..88bba08f 100644
--- a/src/shared/components/Header.js
+++ b/src/shared/components/Header.js
@@ -1,11 +1,11 @@
 "use client";
 
-import { usePathname } from "next/navigation";
+import { usePathname, useRouter } from "next/navigation";
 import Link from "next/link";
 import Image from "next/image";
-import { useRouter } from "next/navigation";
+import PropTypes from "prop-types";
 import { ThemeToggle } from "@/shared/components";
-import { APP_CONFIG, OAUTH_PROVIDERS, APIKEY_PROVIDERS } from "@/shared/constants/config";
+import { OAUTH_PROVIDERS, APIKEY_PROVIDERS } from "@/shared/constants/config";
 
 const getPageInfo = (pathname) => {
   if (!pathname) return { title: "", description: "", breadcrumbs: [] };
@@ -73,7 +73,7 @@ export default function Header({ onMenuClick, showMenuButton = true }) {
         {breadcrumbs.length > 0 ? (
           <div className="flex items-center gap-2">
             {breadcrumbs.map((crumb, index) => (
-              <div key={index} className="flex items-center gap-2">
+              <div key={`${crumb.label}-${crumb.href || "current"}`} className="flex items-center gap-2">
                 {index > 0 && (
                   <span className="material-symbols-outlined text-text-muted text-base">
                     chevron_right
@@ -95,6 +95,7 @@ export default function Header({ onMenuClick, showMenuButton = true }) {
                         width={28}
                         height={28}
                         className="object-contain rounded"
+                        style={{ width: "auto", height: "auto" }}
                         onError={(e) => { e.currentTarget.style.display = "none"; }}
                       />
                     )}
@@ -134,3 +135,8 @@ export default function Header({ onMenuClick, showMenuButton = true }) {
   );
 }
 
+Header.propTypes = {
+  onMenuClick: PropTypes.func,
+  showMenuButton: PropTypes.bool,
+};
+
diff --git a/src/shared/components/OAuthModal.js b/src/shared/components/OAuthModal.js
index fb460edb..b847f2b9 100644
--- a/src/shared/components/OAuthModal.js
+++ b/src/shared/components/OAuthModal.js
@@ -1,6 +1,7 @@
 "use client";
 
 import { useState, useEffect, useRef, useCallback } from "react";
+import PropTypes from "prop-types";
 import { Modal, Button, Input } from "@/shared/components";
 import { useCopyToClipboard } from "@/shared/hooks/useCopyToClipboard";
 
@@ -151,12 +152,12 @@ export default function OAuthModal({ isOpen, provider, providerInfo, onSuccess,
 
       setAuthData({ ...data, redirectUri });
 
-      // For Codex, always use manual input since it requires fixed port 1455
-      if (provider === "codex") {
+      // For Codex or non-localhost: use manual input mode
+      if (provider === "codex" || !isLocalhost) {
         setStep("input");
         window.open(data.authUrl, "_blank");
-      } else if (isLocalhost) {
-        // Other providers on localhost: Open popup and wait for message
+      } else {
+        // Localhost (non-Codex): Open popup and wait for message
         setStep("waiting");
         popupRef.current = window.open(data.authUrl, "oauth_popup", "width=600,height=700");
 
@@ -164,10 +165,6 @@ export default function OAuthModal({ isOpen, provider, providerInfo, onSuccess,
         if (!popupRef.current) {
           setStep("input");
         }
-      } else {
-        // Remote: Show manual input
-        setStep("input");
-        window.open(data.authUrl, "_blank");
       }
     } catch (err) {
       setError(err.message);
@@ -256,7 +253,9 @@ export default function OAuthModal({ isOpen, provider, providerInfo, onSuccess,
           localStorage.removeItem("oauth_callback");
         }
       }
-    } catch (e) {}
+    } catch {
+      // localStorage may be unavailable or data may be malformed - ignore silently
+    }
 
     return () => {
       window.removeEventListener("message", handleMessage);
@@ -430,3 +429,13 @@ export default function OAuthModal({ isOpen, provider, providerInfo, onSuccess,
     </Modal>
   );
 }
+
+OAuthModal.propTypes = {
+  isOpen: PropTypes.bool.isRequired,
+  provider: PropTypes.string,
+  providerInfo: PropTypes.shape({
+    name: PropTypes.string,
+  }),
+  onSuccess: PropTypes.func,
+  onClose: PropTypes.func.isRequired,
+};
diff --git a/src/shared/components/UsageStats.js b/src/shared/components/UsageStats.js
index c9937be9..550d8ca4 100644
--- a/src/shared/components/UsageStats.js
+++ b/src/shared/components/UsageStats.js
@@ -1,6 +1,7 @@
 "use client";
 
 import { useState, useEffect, useMemo, useCallback } from "react";
+import PropTypes from "prop-types";
 import { useSearchParams, useRouter } from "next/navigation";
 import Card from "./Card";
 import Badge from "./Badge";
@@ -11,22 +12,33 @@ function SortIcon({ field, currentSort, currentOrder }) {
   return <span className="ml-1">{currentOrder === "asc" ? "↑" : "↓"}</span>;
 }
 
+SortIcon.propTypes = {
+  field: PropTypes.string.isRequired,
+  currentSort: PropTypes.string.isRequired,
+  currentOrder: PropTypes.string.isRequired,
+};
+
 function MiniBarGraph({ data, colorClass = "bg-primary" }) {
   const max = Math.max(...data, 1);
   return (
     <div className="flex items-end gap-1 h-8 w-24">
-      {data.slice(-9).map((val, i) => (
+      {data.slice(-9).map((val, idx) => (
         <div
-          key={i}
+          key={`bar-${idx}-${val}`}
           className={`flex-1 rounded-t-sm transition-all duration-500 ${colorClass}`}
           style={{ height: `${Math.max((val / max) * 100, 5)}%` }}
-          title={val}
+          title={String(val)}
         />
       ))}
     </div>
   );
 }
 
+MiniBarGraph.propTypes = {
+  data: PropTypes.arrayOf(PropTypes.number).isRequired,
+  colorClass: PropTypes.string,
+};
+
 export default function UsageStats() {
   const router = useRouter();
   const searchParams = useSearchParams();
@@ -235,11 +247,15 @@ export default function UsageStats() {
           </div>
 
           {/* Auto Refresh Toggle */}
-          <label className="text-sm font-medium text-text-muted flex items-center gap-2 cursor-pointer">
+          <div className="text-sm font-medium text-text-muted flex items-center gap-2">
             <span>Auto Refresh ({refreshInterval / 1000}s)</span>
-            <div
+            <button
+              type="button"
               onClick={() => setAutoRefresh(!autoRefresh)}
-              className={`relative inline-flex h-5 w-9 items-center rounded-full transition-colors focus:outline-none ${
+              role="switch"
+              aria-checked={autoRefresh}
+              aria-label="Toggle auto refresh"
+              className={`relative inline-flex h-5 w-9 items-center rounded-full transition-colors focus:outline-none focus:ring-2 focus:ring-primary/50 ${
                 autoRefresh ? "bg-primary" : "bg-bg-subtle border border-border"
               }`}
             >
@@ -248,8 +264,8 @@ export default function UsageStats() {
                   autoRefresh ? "translate-x-5" : "translate-x-1"
                 }`}
               />
-            </div>
-          </label>
+            </button>
+          </div>
         </div>
       </div>
 
@@ -265,9 +281,9 @@ export default function UsageStats() {
               Active Requests
             </div>
             <div className="flex flex-wrap gap-3">
-              {stats.activeRequests.map((req, i) => (
+              {stats.activeRequests.map((req) => (
                 <div
-                  key={i}
+                  key={`${req.model}-${req.provider}-${req.account}`}
                   className="px-3 py-1.5 rounded-md bg-bg-subtle border border-primary/20 text-xs font-mono shadow-sm"
                 >
                   <span className="text-primary font-bold">{req.model}</span>
diff --git a/src/shared/components/layouts/AuthLayout.js b/src/shared/components/layouts/AuthLayout.js
index f2005ef3..790bda2c 100644
--- a/src/shared/components/layouts/AuthLayout.js
+++ b/src/shared/components/layouts/AuthLayout.js
@@ -1,5 +1,6 @@
 "use client";
 
+import PropTypes from "prop-types";
 import ThemeToggle from "../ThemeToggle";
 
 export default function AuthLayout({ children }) {
@@ -22,3 +23,7 @@ export default function AuthLayout({ children }) {
   );
 }
 
+AuthLayout.propTypes = {
+  children: PropTypes.node.isRequired,
+};
+