feat: add pin button to set always visible and focused

Walkthrough

The recent changes introduce a new feature that allows users to pin and unpin the application window, ensuring it stays on top when pinned. This involves adding an is_pinned state to the application, updating window behavior based on this state, and providing a user interface element to toggle the pinned state.

Changes

Files/Modules	Change Summary
`crates/kftray-tauri/src/main.rs`	Added `is_pinned` field to `AppState`, initialized it in `main()`, and added logic to handle pin state.
`crates/kftray-tauri/src/tray.rs`	Adjusted `handle_window_event` to control window behavior based on the pinned state.
`crates/kftray-tauri/src/window.rs`	Updated window visibility logic and added `toggle_pin_state` function to manage the pinned state.
`frontend/src/components/Header/index.tsx`	Added UI elements and logic to toggle pinning/unpinning the window through a new `IconButton`.

Sequence Diagram(s) (Beta)

sequenceDiagram
    participant User
    participant Header as Header Component
    participant Window as Window Module
    participant AppState as AppState

    User->>Header: Clicks Pin/Unpin Button
    Header->>Window: invoke('toggle_pin_state')
    Window->>AppState: Toggle is_pinned State
    AppState->>Window: Return Updated is_pinned State
    Window->>Header: Update UI Based on is_pinned State

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hcavarsan / kftray