Wire input injection into Tauri app

- Add enigo dep with serde feature
- Dual ALPN handlers: frame-stream + input-stream on host
- InputEvent enum with mouse move/click/down/up/scroll, key down/up/click, text
- Host injects received events via enigo (same as spike 006)
- Client opens both frame and input BiStreams on connect
- iroh_client_send_input command sends events through channel to Iroh stream
- Frontend: control mode toggle, canvas mouse capture with coordinate scaling,
  keyboard capture on window when controlling, scroll wheel support
- Register all commands in lib.rs invoke_handler
- lib.rs: add mod commands declaration

commit

8a2aaf0e38d41463390130fe958dabb7f78e5039

parent

087b4d054c4761c999be7e9b3b44508aac33faf4

author

dami etoile <dami.etoile@gmail.com>