feat: add advanced keyboard shortcuts

[maccman]

What

Ports the editor-scoped keyboard behaviors from the v1 Reflect editor, per the porting doc's recommended list:

• Alt-ArrowUp / Alt-ArrowDown — new move-block.ts. Moves the list item under the caret together with its nested children (via prosemirror-flat-list's createMoveListCommand), and falls back to swapping a plain top-level block with its previous/next sibling so the shortcut behaves uniformly outside lists. The caret stays inside the moved block. No-op inside table cells (row swapping is deliberately out of scope) and at document edges.
• [ over a selection — extends wikilink-trigger.ts. Typing [ over a non-empty single-block selection replaces it with [[selection (brackets left open, caret at the end) so the wikilink menu opens with the selection as the query. Guards: a selection already starting with [[ falls through (never [[[), a leading single [ is stripped so a second tap converges, and a bare [ on an empty caret still types literally. Mod-Shift-k keeps its existing behavior via the same command with allowEmpty, and both now decline inside code blocks.
• Mod-Enter follows the link under the caret — new follow-link.ts. Resolves the wikilink, tag, or Markdown link at the caret (wikilink → tag → link) and fires the same onWikilinkClick / onTagClick / onLinkClick handlers a click does, with the KeyboardEvent as event. Off a link the key falls through, so the existing checkbox-task cycle on Mod-Enter is untouched — the plugin runs at Priority.high, ahead of every keymap binding, and returns false when there is nothing to follow. The click payload event types widen to MouseEvent | KeyboardEvent.
• Mod-Shift-7/8/9 — ordered / bullet / task list toggles in the list keymap (Google-Docs semantics via toggleList: same kind unwraps, a different kind converts in place, a non-list block wraps). Resolved through the physical digit key, so layouts where Shift+digit types punctuation still work.
• Escape collapses a non-empty selection — new escape-collapse.ts, bound at Priority.low so the autocomplete menus (which bind Escape at the highest priority) keep dismissing themselves first; a React test verifies an open wikilink menu closes without disturbing the text and only a second press touches the selection.

The EDITOR_KEY_BINDINGS table and the README shortcuts table document all the new bindings (plus the previously missing Mod-Shift-k entry).

Why

These are the most-missed structural edits from the v1 editor — reordering a bullet without cut/paste, linking a selected phrase in two keystrokes, and following links without the mouse. Editor-level bindings belong here in meowdown; the host app only sees the existing click-handler props.

Notes for review

• The Mod-Enter conflict with the task-rotate cycle is the subtle part: follow-link.test.ts covers both sides (on-link follows and leaves the markdown untouched; off-link in the same task item rotates it), plus the modifier guard so Mod-Shift-Enter keeps rotating circle tasks even on a link.
• The list-toggle tests press the physical [Digit7..9] keys to exercise prosemirror-keymap's keyCode fallback for shifted digits. Verified under Chromium locally; worth watching under WebKit in CI.
• No new React props: Mod-Enter reuses the existing onWikilinkClick/onTagClick/onLinkClick threading, installed only when a handler is present.

Testing

• 34 new tests across move-block.test.ts, wikilink-trigger.test.ts, follow-link.test.ts, escape-collapse.test.ts, and extensions to list.test.ts / wikilink-menu.test.tsx, including markdown round-trip assertions.
• Full suite: 66 files, 1092 passed (17 pre-existing expected failures). tsc -b, eslint, oxfmt, and knip all clean.

🤖 Generated with Claude Code

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