feat: UI polish, lint fixes, onboarding redesign, help page expansion, and test improvements

Broad update across dashboard pages, components, extensions, and lib code. Includes ESLint config additions, onboarding flow redesign, settings page refactor, help page content expansion, dead code removal, and test mock fixes. Adds dev docs and public assets.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

components/chat/ChatPanel.tsx

@@ -5,7 +5,7 @@ import { ChatMessage } from './ChatMessage'
 import { ChatInput } from './ChatInput'
 import { useChatStream } from './useChatStream'
 import { useToast } from '@/components/ui/use-toast'
-import { Bot, Trash2, RotateCcw } from 'lucide-react'
+import { Bot, RotateCcw } from 'lucide-react'
 import { Button } from '@/components/ui/button'
 
 interface ChatPanelProps {
@@ -20,7 +20,7 @@ export function ChatPanel({ className }: ChatPanelProps) {
     messages,
     isLoading,
     isStreaming,
-    error,
+    error: _error,
     toolsExecuting,
     sendMessage,
     clearChat,

components/chat/artifacts/ChatAgingBuckets.tsx

@@ -18,8 +18,6 @@ interface ChatAgingBucketsProps {
 export function ChatAgingBuckets({ artifact }: ChatAgingBucketsProps) {
   const { title, buckets, total } = artifact
 
-  const maxAmount = Math.max(...buckets.map((b) => b.amount), 1)
-
   return (
     <div className="w-full">
       <div className="flex items-baseline justify-between mb-3">

components/chat/artifacts/ChatDataTable.tsx

@@ -6,7 +6,7 @@ interface ChatDataTableProps {
   artifact: TableArtifact
 }
 
-function formatCell(value: string | number, align?: 'left' | 'right'): string {
+function formatCell(value: string | number, _align?: 'left' | 'right'): string {
   if (typeof value === 'number') {
     return new Intl.NumberFormat('sv-SE', {
       minimumFractionDigits: value % 1 !== 0 ? 2 : 0,