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/Cargo.toml

@@ -1,12 +1,12 @@
 [package]
-name = "local-time-tracker"
+name = "zeroclock"
 version = "1.0.0"
 description = "A local time tracking app with invoicing"
 authors = ["you"]
 edition = "2021"
 
 [lib]
-name = "local_time_tracker_lib"
+name = "zeroclock_lib"
 crate-type = ["lib", "cdylib", "staticlib"]
 
 [build-dependencies]