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/hooks/use-board-persistence.ts

@@ -0,0 +1,90 @@
+import { useCallback } from "react";
+import { Feature } from "@/store/app-store";
+import { getElectronAPI } from "@/lib/electron";
+import { useAppStore } from "@/store/app-store";
+
+interface UseBoardPersistenceProps {
+  currentProject: { path: string; id: string } | null;
+}
+
+export function useBoardPersistence({
+  currentProject,
+}: UseBoardPersistenceProps) {
+  const { updateFeature } = useAppStore();
+
+  // Persist feature update to API (replaces saveFeatures)
+  const persistFeatureUpdate = useCallback(
+    async (featureId: string, updates: Partial<Feature>) => {
+      if (!currentProject) return;
+
+      try {
+        const api = getElectronAPI();
+        if (!api.features) {
+          console.error("[BoardView] Features API not available");
+          return;
+        }
+
+        const result = await api.features.update(
+          currentProject.path,
+          featureId,
+          updates
+        );
+        if (result.success && result.feature) {
+          updateFeature(result.feature.id, result.feature);
+        }
+      } catch (error) {
+        console.error("Failed to persist feature update:", error);
+      }
+    },
+    [currentProject, updateFeature]
+  );
+
+  // Persist feature creation to API
+  const persistFeatureCreate = useCallback(
+    async (feature: Feature) => {
+      if (!currentProject) return;
+
+      try {
+        const api = getElectronAPI();
+        if (!api.features) {
+          console.error("[BoardView] Features API not available");
+          return;
+        }
+
+        const result = await api.features.create(currentProject.path, feature);
+        if (result.success && result.feature) {
+          updateFeature(result.feature.id, result.feature);
+        }
+      } catch (error) {
+        console.error("Failed to persist feature creation:", error);
+      }
+    },
+    [currentProject, updateFeature]
+  );
+
+  // Persist feature deletion to API
+  const persistFeatureDelete = useCallback(
+    async (featureId: string) => {
+      if (!currentProject) return;
+
+      try {
+        const api = getElectronAPI();
+        if (!api.features) {
+          console.error("[BoardView] Features API not available");
+          return;
+        }
+
+        await api.features.delete(currentProject.path, featureId);
+      } catch (error) {
+        console.error("Failed to persist feature deletion:", error);
+      }
+    },
+    [currentProject]
+  );
+
+  return {
+    persistFeatureCreate,
+    persistFeatureUpdate,
+    persistFeatureDelete,
+  };
+}