feat: in-app controller test screen

[nextestudios]

Summary

Lets the maintainer run the #78 hardware matrix on Windows without installing the .NET SDK (previously dotnet run tools/ControlFS.InputProbe).

• Menu → "Teste de controles…" (new ControllerTestModal, AppController.ControllerTest.cs):
  • lists every connected device from the input layer (new IControllerDiagnostics, implemented by InputHost): name, SDL gamepad type, detected ControllerFamily, VID:PID, gamepad or raw joystick (with saved profile, if any), virtual, active, and devices that disconnected during the session;
  • shows live each press as physical control → InputAction (e.g. South (Botão A) → Confirm). InputHost brackets each routed control with BeginTestInput/EndTestInput, so the action the real InputRouter emits is paired with the press; presses that produce nothing (other device active, raw joystick without profile) show "no action". Raw joysticks show the raw input (button 3, hat 1 ↑, axis 2 +), and with a profile the raw input and the translated control together. Nothing repeats and nothing executes on this screen.
  • Copy report: hold Confirm 1 s (or Enter, or tap the button) copies a plain-text English report: app version, Windows version, SDL version, confirm convention, each device's fields and all result lines. No user names, device paths, GUIDs or serial numbers.
  • Leave: hold Back 1 s on the controller (short Back is being tested) or Esc.
• Clipboard write lives in MainWindow (DataPackage + Flush), exposed to the controller as AppController.CopyText. UI additions are limited to one modal builder in ModalView and two lines in MainWindow.
• Docs: docs/controller-compatibility.md and docs/TESTING.md now have a step-by-step for the maintainer (which controllers, what to press, expected actions, paste the report as a comment on test: validate the controller matrix on real hardware #78); GUIDE pair and both changelogs updated.

Tests

• CI: ControllerTestJourneyTests drives the screen through the menu with the real InputRouter: short presses only log (South → Confirm, East → Back, Start → OpenAppMenu), raw unprofiled input logs with no action, holding Confirm copies a report that contains the results and VID:PID but not the device path/serial or GUID, holding Back 1 s (not 0.5 s) closes.
• Manual (needs real hardware, listed in docs/TESTING.md): the actual matrix run, clipboard on real Windows, hot-plug and active-device display.

Refs #78 (stays open: the hardware matrix needs the maintainer's controllers)

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