fix: open image previews from touchend so iOS taps don't raise the keyboard

[maccman]

Problem

#253 prevented pointerdown on image previews so a touch tap wouldn't focus the editor. That suppresses the compatibility mouse events, but on iOS WebKit tap-to-focus is a native gesture default action tied to the touch event stream: tapping an image preview still focuses the surrounding contenteditable and briefly raises the software keyboard, right as the click handler opens its own surface (e.g. a lightbox) — a visible keyboard show/hide flash on every image tap.

Fix

The only thing that stops WebKit's synthetic-click/focus path is cancelling the tap's touchend. That also suppresses the synthetic click, so defineImageClickHandler now recognizes taps itself:

• touchstart records a single-finger touch on a preview (touches on the resize handle are excluded — they start a resize, never a tap)
• touchmove past a 10px tolerance invalidates it (scroll/drag)
• touchend on a still-valid tap calls preventDefault() and fires onClick directly

Mouse clicks keep going through handleClick unchanged, and the #253 pointerdown guard stays for non-WebKit touch surfaces.

ImageClickPayload.event widens to MouseEvent | TouchEvent since the touch path hands the handler the originating touchend.

Testing

• 3 new browser tests: a stationary tap fires onClick once with the touchend cancelled; a moved touch is ignored and left uncancelled; a tap on the resize handle is left alone.
• pnpm exec vitest run --project @meowdown/core image — 27/27 pass.
• pnpm typecheck clean; changed files lint clean.
• Manual verification in the Reflect iOS app (where the flash reproduces) is in progress on the consumer side.

🤖 Generated with Claude Code

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