feat(ui,markdown): add collapsible 'Thoughts' for <think>, sanitize titles, improve focus UX; refactor table/blockquote render & styles

Backend: HTML-unescape and strip <think>/<thinking> from generated titles; trim and return cleaned value; add debug logs.

Electron: send 'window-focused' from main; expose onWindowFocus in preload.

Frontend: stream-safe AssistantMessageContent with collapsible Thoughts; switch streaming render to React state updates; autofocus textarea on window focus/new chat and when clicking empty chat area; sanitize session title client-side.

Markdown: support blockquotes; allow '-' or '*' bullets; simplify <think> removal to handle streaming; drop table wrapper div (emit <table class='nice'>); theme-aware code block headers/borders.

CSS: rounded 'nice' tables with light inner grid; blockquote styling; Thoughts toggle/panel styles.

Color: brighten Grayscale --accent.

Follow-ups: add IPC listener cleanup; ensure single source of truth for colorSchemes.

electron/main.cjs

@@ -58,6 +58,10 @@ async function createMainWindow () {
     mainWindow.show()
   })
 
+  mainWindow.on('focus', () => {
+    mainWindow.webContents.send('window-focused');
+  });
+
   if (is.dev && process.env.VITE_DEV_SERVER_URL) {
     await mainWindow.loadURL(process.env.VITE_DEV_SERVER_URL)
     mainWindow.webContents.openDevTools({ mode: 'detach' })

electron/preload.cjs

@@ -10,5 +10,6 @@ contextBridge.exposeInMainWorld('electronAPI', {
     event.preventDefault();
     const url = event.currentTarget.href;
     ipcRenderer.send('open-external-link', url);
-  }
+  },
+  onWindowFocus: (callback) => ipcRenderer.on('window-focused', callback)
 })