Fix blank UI on Windows; add ML env option to uninstaller

Blank UI on Windows:
- Call app.disableHardwareAcceleration() on win32 before app.whenReady()
  to prevent blank-screen issue caused by certain GPU drivers (very
  common Electron/Windows bug)
- Use show:false + ready-to-show event so the window appears only after
  content is rendered, eliminating the blank flash on slow machines
- Add F12 / Ctrl+Shift+I shortcut to open DevTools for in-field debugging
- Wrap init() with .catch() so any startup error shows a readable message
  instead of a silent blank screen

Uninstaller improvements:
- Add "Keep ML environment" checkbox (was always deleted before)
- All three items (venv, content, settings) are now opt-in to delete,
  defaulting to Keep so no accidental data loss
- Update preload.js runUninstall() and main.js handler to accept keepVenv
- Update size display copy to reflect the new opt-in model

Author: nodeeeeee

electron/main.js

@@ -719,11 +719,13 @@ function registerIpc() {
     };
   });
 
-  ipcMain.handle('uninstall:run', async (_, { keepContent, keepSettings }) => {
+  ipcMain.handle('uninstall:run', async (_, { keepContent, keepSettings, keepVenv }) => {
     try {
-      // 1. Always delete ML venv (large, no user value without the app)
-      const venvDir = path.join(DATA_DIR, 'venv');
-      if (fs.existsSync(venvDir)) rmRecursive(venvDir);
+      // 1. Optionally delete ML venv
+      if (!keepVenv) {
+        const venvDir = path.join(DATA_DIR, 'venv');
+        if (fs.existsSync(venvDir)) rmRecursive(venvDir);
+      }
 
       // 2. Optionally delete generated content (OUTPUT_DIR if separate from DATA_DIR)
       if (!keepContent) {
@@ -772,18 +774,32 @@ function createWindow() {
     height:    780,
     minWidth:  720,
     minHeight: 520,
+    show:            false,   // wait for ready-to-show to avoid blank flash
     backgroundColor: '#1E2A2A',
     webPreferences: {
       preload:          path.join(__dirname, 'preload.js'),
       nodeIntegration:  false,
       contextIsolation: true,
     },
   });
+  mainWindow.once('ready-to-show', () => mainWindow.show());
   mainWindow.loadFile(path.join(__dirname, 'renderer', 'index.html'));
   if (process.env.AUTONOTE_DEV) mainWindow.webContents.openDevTools();
+  // F12 / Ctrl+Shift+I opens DevTools for in-field debugging
+  mainWindow.webContents.on('before-input-event', (_, input) => {
+    if (input.type !== 'keyDown') return;
+    if (input.key === 'F12' ||
+        (input.control && input.shift && input.key === 'I')) {
+      mainWindow.webContents.openDevTools();
+    }
+  });
   mainWindow.on('closed', () => { mainWindow = null; });
 }
 
+// Disable GPU hardware acceleration on Windows to prevent blank white/teal
+// screen that can occur with certain GPU drivers (very common Electron issue).
+if (process.platform === 'win32') app.disableHardwareAcceleration();
+
 app.whenReady().then(() => {
   registerIpc();
   createWindow();

electron/package.json

@@ -1,6 +1,6 @@
 {
   "name": "auto-note",
-  "version": "0.9.0",
+  "version": "0.9.2",
   "description": "AutoNote — lecture notes generator from Canvas recordings",
   "main": "main.js",
   "scripts": {

electron/preload.js

@@ -58,5 +58,5 @@ contextBridge.exposeInMainWorld('api', {
 
   // ── Uninstaller ───────────────────────────────────────────────────────────
   getUninstallSizes: ()                             => ipcRenderer.invoke('uninstall:sizes'),
-  runUninstall:      (keepContent, keepSettings)    => ipcRenderer.invoke('uninstall:run', { keepContent, keepSettings }),
+  runUninstall:      (keepContent, keepSettings, keepVenv) => ipcRenderer.invoke('uninstall:run', { keepContent, keepSettings, keepVenv }),
 });

electron/renderer/app.js

@@ -728,12 +728,16 @@ function buildUninstallSection() {
     <div style="margin-top:24px;padding:16px;border:1px solid var(--c-red,#e53935);border-radius:8px;background:rgba(229,57,53,0.06)">
       <div style="font-weight:600;font-size:14px;color:var(--c-red,#e53935);margin-bottom:6px">Danger Zone — Uninstall AutoNote</div>
       <div style="font-size:12px;color:var(--c-white-60);margin-bottom:12px">
-        The ML environment will always be removed. Choose what else to keep.
+        Choose what to remove. Unchecked items will be permanently deleted.
       </div>
       <div id="uninstall-sizes" style="font-size:12px;color:var(--c-white-60);margin-bottom:12px;line-height:1.8">
         Calculating sizes…
       </div>
       <div style="display:flex;flex-direction:column;gap:8px;margin-bottom:14px">
+        <label style="display:flex;align-items:center;gap:8px;font-size:13px;cursor:pointer">
+          <input type="checkbox" id="uninstall-keep-venv" checked>
+          Keep ML environment (PyTorch, Whisper, sentence-transformers, …)
+        </label>
         <label style="display:flex;align-items:center;gap:8px;font-size:13px;cursor:pointer">
           <input type="checkbox" id="uninstall-keep-content" checked>
           Keep generated content (notes, captions, alignment, videos, materials)
@@ -1301,9 +1305,8 @@ async function attachPageHandlers() {
       try {
         const s = await window.api.getUninstallSizes();
         const fmt = mb => mb >= 1024 ? `${(mb/1024).toFixed(1)} GB` : `${mb} MB`;
-        let html = `<b>Always deleted:</b><br>`;
+        let html = `<b>Disk usage (controlled by checkboxes below):</b><br>`;
         html += `&nbsp;&nbsp;• ML Environment (~/.auto_note/venv): <b>${fmt(s.venv)}</b><br>`;
-        html += `<br><b>Optional (controlled by checkboxes below):</b><br>`;
         html += `&nbsp;&nbsp;• Settings &amp; config (~/.auto_note/): <b>${fmt(s.settings)}</b><br>`;
         if (s.content !== null) {
           html += `&nbsp;&nbsp;• Generated content (${s.outputDir}): <b>${fmt(s.content)}</b>`;
@@ -1316,11 +1319,14 @@ async function attachPageHandlers() {
 
     // Uninstall button
     document.getElementById('btn-uninstall')?.addEventListener('click', async () => {
+      const keepVenv     = document.getElementById('uninstall-keep-venv')?.checked ?? true;
       const keepContent  = document.getElementById('uninstall-keep-content')?.checked ?? true;
       const keepSettings = document.getElementById('uninstall-keep-settings')?.checked ?? true;
-      const lines = ['This will permanently delete:', '  • ML environment (~/.auto_note/venv)'];
+      const lines = ['This will permanently delete:'];
+      if (!keepVenv)     lines.push('  • ML environment (~/.auto_note/venv)');
       if (!keepSettings) lines.push('  • All settings, API keys, and credentials');
       if (!keepContent)  lines.push('  • All generated content (notes, captions, videos…)');
+      if (lines.length === 1) lines.push('  (nothing — all items are set to Keep)');
       lines.push('', 'This cannot be undone. Continue?');
 
       if (!confirm(lines.join('\n'))) return;
@@ -1329,7 +1335,7 @@ async function attachPageHandlers() {
       btn.disabled = true;
       btn.textContent = 'Uninstalling…';
 
-      const result = await window.api.runUninstall(keepContent, keepSettings);
+      const result = await window.api.runUninstall(keepContent, keepSettings, keepVenv);
       if (result.ok) {
         const isWin = result.platform === 'win32';
         alert(
@@ -1435,4 +1441,15 @@ async function init() {
   renderPage();
 }
 
-init();
+init().catch(err => {
+  // If init() throws (e.g. IPC timeout or JS error), show a visible error
+  // instead of a silent blank screen.
+  document.body.innerHTML =
+    `<div style="padding:40px;font-family:monospace;color:#EF5350;background:#1E2A2A;height:100vh">
+      <h2 style="margin-bottom:16px">AutoNote failed to start</h2>
+      <pre style="white-space:pre-wrap;font-size:12px">${String(err?.stack || err)}</pre>
+      <p style="margin-top:16px;color:#aaa;font-size:12px">
+        Press F12 to open DevTools for more details, then reload (Ctrl+R).
+      </p>
+    </div>`;
+});