refactor(board-view): reorganize into modular folder structure

- Extract board-view into organized subfolders following new pattern:
  - components/: kanban-card, kanban-column
  - dialogs/: all dialog and modal components (8 files)
  - hooks/: all board-specific hooks (10 files)
  - shared/: reusable components between dialogs (model-selector, etc.)
- Rename all files to kebab-case convention
- Add barrel exports (index.ts) for clean imports
- Add docs/folder-pattern.md documenting the folder structure
- Reduce board-view.tsx from ~3600 lines to ~490 lines

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/app/src/components/views/board-view/shared/model-constants.ts

@@ -0,0 +1,70 @@
+import { AgentModel, ThinkingLevel } from "@/store/app-store";
+import {
+  Brain,
+  Zap,
+  Scale,
+  Cpu,
+  Rocket,
+  Sparkles,
+} from "lucide-react";
+
+export type ModelOption = {
+  id: AgentModel;
+  label: string;
+  description: string;
+  badge?: string;
+  provider: "claude";
+};
+
+export const CLAUDE_MODELS: ModelOption[] = [
+  {
+    id: "haiku",
+    label: "Claude Haiku",
+    description: "Fast and efficient for simple tasks.",
+    badge: "Speed",
+    provider: "claude",
+  },
+  {
+    id: "sonnet",
+    label: "Claude Sonnet",
+    description: "Balanced performance with strong reasoning.",
+    badge: "Balanced",
+    provider: "claude",
+  },
+  {
+    id: "opus",
+    label: "Claude Opus",
+    description: "Most capable model for complex work.",
+    badge: "Premium",
+    provider: "claude",
+  },
+];
+
+export const THINKING_LEVELS: ThinkingLevel[] = [
+  "none",
+  "low",
+  "medium",
+  "high",
+  "ultrathink",
+];
+
+export const THINKING_LEVEL_LABELS: Record<ThinkingLevel, string> = {
+  none: "None",
+  low: "Low",
+  medium: "Med",
+  high: "High",
+  ultrathink: "Ultra",
+};
+
+// Profile icon mapping
+export const PROFILE_ICONS: Record<
+  string,
+  React.ComponentType<{ className?: string }>
+> = {
+  Brain,
+  Zap,
+  Scale,
+  Cpu,
+  Rocket,
+  Sparkles,
+};