Navigation and value-step actions (Nav Up/Down/Left/Right, Next/Prev
Column, Increment/Decrement) now auto-repeat while their control is held —
fire once on press, then accelerate from 320ms to 45ms per step — and stop
the instant it's released. Implemented ONCE as a shared repeater in
InputRouter (pressRepeat/releaseRepeat, keyed by the physical control id),
so all three hardware inputs get identical behaviour:
* Keyboard: the OS's own key auto-repeat is now ignored (held notes sustain
instead of retriggering) and holds are driven by the shared repeater;
key-up ends it.
* Gamepad: buttons, D-pad hat AND analog sticks repeat (they all funnel
through controlDown/controlUp); releasing the main control stops it,
releasing a chord modifier does not.
* MIDI: a momentary nav CC repeats between its press (value>=64) and
release (value<64).
One-shots (transport, tab switch, notes, clear) are unaffected — they fire
once even when held. InputRouter takes an injectable dispatcher so the new
InputRouterTest drives the accelerating schedule on a virtual clock
(verifies repeat-while-held, stop-on-release, one-shot-fires-once, and that
an unrelated release doesn't stop the active repeat). All unit tests pass;
on-device smoke confirms single-press nav + transport still work, no crash.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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