fix: keep the caret out of hidden marker

[ocavue]

Draft. Fixes the hide-mode bug where the caret rests between a hidden Markdown marker and its content, so Enter/Space/typing corrupt the unit (clicking left of **foo** then Enter yields ** / foo**). Adds defineCaretMarkerSnap: an appendTransaction that snaps a pointer caret to the unit's outer edge and skips a keyboard caret over invisible marker interiors, plus a high-priority Enter keymap that relocates the split. Gated to hide mode only (in focus/show the markers are visible, so no trap). The full @meowdown/core suite passes (941) with no regressions.

Known-failing tests, left as the hard display:none follow-ups (each is commented in caret-marker-snap.test.ts):

• click-then-Space/typing: the model selection snaps to the outer edge, but the browser's DOM insertion resolves the zero-width hidden ** to the inner position anyway (Enter works because it uses the model selection).
• hide-mode arrow nav stops at the content edge instead of reaching the unit's outer edge (the browser natively skips display:none then gets stuck; no selection change fires for appendTransaction to nudge).
• link click hit-testing in hide mode is unreliable (the zone/snap logic does handle a link's ](url) tail).

Design notes and experiments: brain projects/meowdown/PLAN_2026-06-30_18-58_caret-deadzone-in-hidden-markers.md.

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Project	Deployment	Actions	Updated (UTC)
meowdown	Ignored		Jun 30, 2026 11:39am

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commit: 8bb01c1