feat(feature-suggestions): implement feature suggestions and spec regeneration functionality

- Introduced a new `FeatureSuggestionsService` to analyze projects and generate feature suggestions based on the project structure and existing features.
- Added IPC handlers for generating and stopping feature suggestions, as well as checking their status.
- Implemented a `SpecRegenerationService` to create and regenerate application specifications based on user-defined project overviews and definitions.
- Enhanced the UI with a `FeatureSuggestionsDialog` for displaying generated suggestions and allowing users to import them into their project.
- Updated the sidebar and board view components to integrate feature suggestions and spec regeneration functionalities, improving project management capabilities.

These changes significantly enhance the application's ability to assist users in feature planning and specification management.

app/electron/preload.js

@@ -139,6 +139,58 @@ contextBridge.exposeInMainWorld("electronAPI", {
       };
     },
   },
+
+  // Feature Suggestions API
+  suggestions: {
+    // Generate feature suggestions
+    generate: (projectPath) =>
+      ipcRenderer.invoke("suggestions:generate", { projectPath }),
+
+    // Stop generating suggestions
+    stop: () => ipcRenderer.invoke("suggestions:stop"),
+
+    // Get suggestions status
+    status: () => ipcRenderer.invoke("suggestions:status"),
+
+    // Listen for suggestions events
+    onEvent: (callback) => {
+      const subscription = (_, data) => callback(data);
+      ipcRenderer.on("suggestions:event", subscription);
+
+      // Return unsubscribe function
+      return () => {
+        ipcRenderer.removeListener("suggestions:event", subscription);
+      };
+    },
+  },
+
+  // Spec Regeneration API
+  specRegeneration: {
+    // Create initial app spec for a new project
+    create: (projectPath, projectOverview, generateFeatures = true) =>
+      ipcRenderer.invoke("spec-regeneration:create", { projectPath, projectOverview, generateFeatures }),
+
+    // Regenerate the app spec
+    generate: (projectPath, projectDefinition) =>
+      ipcRenderer.invoke("spec-regeneration:generate", { projectPath, projectDefinition }),
+
+    // Stop regenerating spec
+    stop: () => ipcRenderer.invoke("spec-regeneration:stop"),
+
+    // Get regeneration status
+    status: () => ipcRenderer.invoke("spec-regeneration:status"),
+
+    // Listen for regeneration events
+    onEvent: (callback) => {
+      const subscription = (_, data) => callback(data);
+      ipcRenderer.on("spec-regeneration:event", subscription);
+
+      // Return unsubscribe function
+      return () => {
+        ipcRenderer.removeListener("spec-regeneration:event", subscription);
+      };
+    },
+  },
 });
 
 // Also expose a flag to detect if we're in Electron