feat: v0.12.0 — fix streaming tool UI persistence, file tree UX improvements, unify icon library

Streaming tool UI fix (ChatView.tsx):
- Add toolUsesRef/toolResultsRef to reliably track tool data across closures
- Serialize tool_use/tool_result into JSON content-blocks array when building
  assistant message after stream ends, matching backend storage format
- MessageItem.parseToolBlocks() now renders tool UI from history messages
- Clean up refs in finally block and timeout auto-retry path

File tree UX (FileTree.tsx, file-tree.tsx):
- Remove folder path header from right panel, merge search + refresh into one row
- Remove file icon spacer (size-5) so file icons align flush with search box
- Change folder icon color from blue to muted-foreground

Chat list panel (ChatListPanel.tsx):
- Folder header: expanded uses FolderOpenIcon, collapsed uses Folder01Icon
- Add tooltip showing full working directory path on folder hover
- Double-click folder header opens in system file manager

Title bar folder name (chat/[id]/page.tsx):
- Add tooltip with full path on project name hover
- Click opens folder in Finder/Explorer via Electron IPC or API fallback

Open folder support:
- electron/main.ts: add shell:open-path IPC handler via shell.openPath
- electron/preload.ts: expose electronAPI.shell.openPath to renderer
- api/files/open/route.ts: fallback API route using open/explorer/xdg-open

Unify icon library — migrate app-level components from Lucide to Hugeicons:
- file-tree.tsx: folder, file, chevron, plus icons
- tool-actions-group.tsx: chevron expand icon
- MessageItem.tsx: copy, check, expand/collapse icons
- MessageInput.tsx: stop button (SquareIcon → StopIcon)
- FileCard.tsx: file icon
- ImageLightbox.tsx: left/right navigation arrows
- InstallWizard.tsx: status icons (check, x, minus, loader, circle, copy, download)
- Keep Lucide in ui/ and ai-elements/ base layers (shadcn standard)

electron/main.ts

@@ -1,4 +1,4 @@
-import { app, BrowserWindow, nativeImage, dialog, session, utilityProcess, ipcMain } from 'electron';
+import { app, BrowserWindow, nativeImage, dialog, session, utilityProcess, ipcMain, shell } from 'electron';
 import path from 'path';
 import { execFileSync, spawn, ChildProcess } from 'child_process';
 import fs from 'fs';
@@ -707,6 +707,11 @@ app.whenReady().then(async () => {
 
   // --- End install wizard IPC handlers ---
 
+  // Open a folder in the system file manager (Finder / Explorer)
+  ipcMain.handle('shell:open-path', async (_event: Electron.IpcMainInvokeEvent, folderPath: string) => {
+    return shell.openPath(folderPath);
+  });
+
   try {
     let port: number;
 

electron/preload.ts

@@ -7,6 +7,9 @@ contextBridge.exposeInMainWorld('electronAPI', {
     node: process.versions.node,
     chrome: process.versions.chrome,
   },
+  shell: {
+    openPath: (folderPath: string) => ipcRenderer.invoke('shell:open-path', folderPath),
+  },
   install: {
     checkPrerequisites: () => ipcRenderer.invoke('install:check-prerequisites'),
     start: (options?: { includeNode?: boolean }) => ipcRenderer.invoke('install:start', options),