Harden scroll-mode keyboard suppression to prevent intermittent text echo

[Copilot]

While scroll mode is active, some key events were occasionally falling through to the focused app, causing unintended character input (for example in editors). This change makes scroll-mode suppression deterministic by treating hook handling as fail-closed during that mode.

• Input suppression behavior

  • In TrayApplicationContext, HandleKeyboardHookKeyDown and HandleKeyboardHookKeyUp now capture whether the app is in ScrollMode at entry and always return handled when it is.
  • This prevents any key from leaking to the foreground window during a scroll-mode session, including edge paths where downstream handlers return false.

• Scope of change

  • Kept to keyboard-hook return-path logic only; no changes to scroll direction mapping, mode transitions, or settings behavior.

var handled = RunOnUiThread(() => OnGlobalKeyDown(key));
return isScrollMode || handled;

• Fixes Suppression of characters printing while in scroll mode fails at time #9

[0RuiAlvel0]

nope, this screwed up the interaction. It was impossible to come out of scroll mode with esc - this issue needs more attention. Not merged, not accepted not even for further review.