[codex] Improve floating bar widget styling

[romeroej2]

Summary

• Adds a configurable floating bar size slider so the widget can scale icons, text, and pill spacing.
• Adds a user-selected visual style choice that preserves both the original floating glass look and the new Windows taskbar widget look.
• Adds optional inline reset time display with a reset icon, keeping the actual reset time visible while replacing the reset label text.
• Refreshes the native floatbar interaction state after resize/show events so it is less likely to appear on top while mouse events pass through unexpectedly.
• Cleans up select styling in settings and addresses clippy warnings found during validation.

Style note

This is intentionally a fully style-oriented PR. The goal is to explore a Windows taskbar-widget-like floating bar that visually sits on the bar, similar in spirit to macOS widgets. If this style is not preferred, that is fine; it is a matter of visual preference and can stay user-selected alongside the original floating glass option.

Validation

• cargo fmt --all
• cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings
• cargo clippy --manifest-path apps/desktop-tauri/src-tauri/Cargo.toml --all-targets -- -D warnings
• cargo test --manifest-path rust/Cargo.toml float_bar
• cargo test --manifest-path apps/desktop-tauri/src-tauri/Cargo.toml floatbar
• pnpm test src/floatbar/FloatBar.test.tsx
• pnpm build
• git diff --check