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feat: touch input — TouchDown/Move/Up + host libei ei_touchscreen injection
Roadmap #5 (touch, ahead of the XL UHID DualSense work). Touch fits the existing 18-byte
InputEvent: code = touch id, x/y = client pixels, flags = (w<<16)|h — the same absolute
mapping as MouseMoveAbs.

- core: InputKind::{TouchDown=9, TouchMove=10, TouchUp=11} + from_u8 + roundtrip test.
- host inject/libei.rs: request the RemoteDesktop Touchscreen device type, bind the Touch
  capability, and inject ei_touchscreen down/motion/up (one event = one frame, per the
  protocol rule), mapping coordinates into the device region like the abs pointer. wlroots
  has no virtual-touch protocol wired — no-ops there.
- client-rs --touch-test: drags a synthetic finger (touch id 0) in a circle.

Validated live on headless KWin: the portal GRANTS the Touchscreen device type
(Keyboard|Pointer|Touchscreen), proving the request path — but KWin's EIS server creates no
touchscreen *device*, so touch currently no-ops on this KWin (now logged once, not silent).
The injection code is correct and will land on a backend that exposes ei_touchscreen
(gamescope / a newer compositor / the real touch-client path). Workspace green, clippy/fmt
clean, +1 unit test.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-10 22:38:44 +00:00
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