feat: tooltips, two-column timer, font selector, tray behavior, icons, readme

- Custom tooltip directive (WCAG AAA) on every button in the app
- Two-column timer layout with sticky hero and recent entries sidebar
- Timer font selector with 16 monospace Google Fonts and live preview
- UI font selector with 15+ Google Fonts
- Close-to-tray and minimize-to-tray settings
- New app icons (no-glow variants), platform icon set
- Mini timer pop-out window
- Favorites strip with drag-reorder and inline actions
- Comprehensive README with feature documentation
- Remove tracked files that belong in gitignore

src-tauri/tauri.conf.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
-  "productName": "LocalTimeTracker",
+  "productName": "ZeroClock",
   "version": "1.0.0",
   "identifier": "com.localtimetracker.app",
   "build": {
@@ -12,7 +12,7 @@
   "app": {
     "windows": [
       {
-        "title": "LocalTimeTracker",
+        "title": "ZeroClock",
         "width": 1200,
         "height": 800,
         "minWidth": 800,
@@ -20,12 +20,21 @@
         "decorations": false,
         "transparent": false,
         "resizable": true
+      },
+      {
+        "label": "mini-timer",
+        "url": "mini-timer.html",
+        "title": "Timer",
+        "width": 300,
+        "height": 80,
+        "decorations": false,
+        "transparent": false,
+        "resizable": false,
+        "alwaysOnTop": true,
+        "skipTaskbar": true,
+        "visible": false
       }
     ],
-    "trayIcon": {
-      "iconPath": "icons/icon.png",
-      "iconAsTemplate": true
-    },
     "security": {
       "csp": null
     }