fix(events): suppress selection on click-intent presses (B8 / #61)

[re-marked]

Closes #61.

Summary

Press intent classified up front into gesture-confirmed | gesture-tentative | click | select. The click intent (no capture, hit chain has onClick, no force-select modifier) skips startSelection AND multi-click escalation, then fires onClickAt on release via App.pressIntentClick. Force-select modifier (Shift/Alt) demotes click → select so consumers can still highlight text inside a clickable region (Button label, link anchor text). Confirmed/tentative gestures still take precedence — captureGesture always wins.

Pre-fix: a press over any Box with onClick started a selection drag; accidental motion between press and release escalated into a selection, eating the click.

Commits

1. feat(events): add computePressIntent helper — pure helper + truth-table tests
2. feat(events): dispatchMouseDown reports clickable — single tree walk, both signals
3. fix(events): suppress selection on click-intent presses — wire intent + flag lifecycle
4. test(events): integration tests for click-intent — B8 repro + counter-cases + Shift/Alt + multi-click + gesture priority
5. docs: note press intent classification

Test plan

• pnpm typecheck clean
• pnpm lint clean
• pnpm build clean
• pnpm test — 760 passed (was 748; +12 integration + 12 truth-table − 0 regressions)

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