The `slash menu /table creates a table` e2e encoded the regressed
behaviour (the quick-insert dropped a default table directly). With the
grid picker restored, `/table` now opens the picker and the table is
created at the picked size. Rework the spec accordingly and register the
plugin in the e2e host + examples demo so the picker actually mounts:

  - register `TableChessboard` in `e2e/host/main.ts` (the host did not
    `Muya.use` it, so the dispatched `muya-table-picker` had no
    subscriber) and in `examples/src/main.ts` for dev parity;
  - add `floats.tablePicker` + `tablePickerCell(row, column)` selectors;
  - the `/table` spec now asserts the picker shows (and no table exists
    yet), then picks the (1, 2) cell and asserts a 2×3 table is created
    and the picker hides (probing the float wrapper opacity, matching the
    emoji-picker convention).

The cross-cell table-selection e2e specs (#4435) are untouched and still
pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…sboard deletion + wire trigger) (#4437)

* revert(muya): restore the deleted TableChessboard grid picker plugin

#4435 deleted `src/ui/tableChessboard/` (the table grid dimension picker)
on the premise that it was dead code — registered-but-untriggered because
the @muyajs/core TS rewrite never ported the legacy `showTablePicker`
trigger. The plugin itself is a real, working muyajs feature; only its
trigger was missing. Restore the plugin verbatim from the pre-#4435 tree
and re-wire its engine-side hooks so the trigger (added in the next
commit) has something to drive:

  - recover `tableChessboard/index.ts` + `index.css` byte-for-byte;
  - re-export `TableChessboard` from the package entrypoint;
  - restore the `'mu-table-picker'` float-tool name guard in
    `content.ts` (keeps Enter/Tab/arrow keys captured by the float while
    the picker is open) and the baseFloat `(row, column)` doc-comment;
  - drop the now-obsolete `tableChessboardRemoved` removal spec; its
    restoration counterpart lands with the trigger.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* build(desktop): re-register TableChessboard plugin with Muya

#4435 also removed the desktop wiring for the table grid picker. Restore
it so the renderer registers the plugin again:

  - `Muya.use(TableChessboard)` + its import in `editor.vue`;
  - the `TableChessboard` declaration in the `@muyajs/core` type shim.

The separate desktop "Paragraph -> Table" menu flow (el-dialog ->
`createTable`) is untouched and still works.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(muya): wire the in-editor "table" insert to the grid picker

Port legacy muyajs `paragraphCtrl.showTablePicker` into the engine so the
in-editor table insert shows the restored hover-grid dimension picker
instead of dropping a fixed-size table.

Both in-editor "table" entry points — the `/` quick-insert menu and the
paragraph front-menu — route through `replaceBlockByLabel`, so a single
interception there covers both: `label === 'table'` now emits
`muya-table-picker` with a caret position reference (falling back to the
block's DOM node) and an `(row, column)` callback that calls
`Muya.createTable({ rows: row + 1, columns: column + 1 })`. The restored
`TableChessboard` subscribes to that event and invokes the callback on
pick, so the picker works end-to-end. The dead `case 'table'` fall-through
in the switch is removed.

This is the trigger the TS rewrite dropped — in legacy muyajs every
in-editor "table" insert (quick-insert, front-menu, and the paragraph
menu's `case 'table'`) went through `showTablePicker`; this restores that
behaviour. The desktop "Paragraph -> Table" menu keeps its own el-dialog
-> `createTable` flow (it intercepts before `updateParagraph`), so it is
unaffected.

Tests:
  - `replaceBlockByLabel` for `label: 'table'` dispatches
    `muya-table-picker` (not a default table) and its handler creates a
    table at (row + 1) x (column + 1);
  - `TableChessboard` is exported, registers, subscribes to the event,
    renders the 6x8 grid, and reports the picked `(row, column)` on click.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* test(muya): update e2e for the restored table grid picker

The `slash menu /table creates a table` e2e encoded the regressed
behaviour (the quick-insert dropped a default table directly). With the
grid picker restored, `/table` now opens the picker and the table is
created at the picked size. Rework the spec accordingly and register the
plugin in the e2e host + examples demo so the picker actually mounts:

  - register `TableChessboard` in `e2e/host/main.ts` (the host did not
    `Muya.use` it, so the dispatched `muya-table-picker` had no
    subscriber) and in `examples/src/main.ts` for dev parity;
  - add `floats.tablePicker` + `tablePickerCell(row, column)` selectors;
  - the `/table` spec now asserts the picker shows (and no table exists
    yet), then picks the (1, 2) cell and asserts a 2×3 table is created
    and the picker hides (probing the float wrapper opacity, matching the
    emoji-picker convention).

The cross-cell table-selection e2e specs (#4435) are untouched and still
pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(muya): harden table picker footer input (NaN guard) and _select aliasing

The footer row/column `keyupHandler` guarded the numeric path with
`typeof value === 'number'`, which is also true for `NaN` — typing a
non-numeric value parsed to NaN and set the dimension to NaN. Guard with
`!Number.isNaN(value)` instead so only real numbers update the count.

`showPicker` also aliased `_current` and `_select` to the same object,
so footer-input edits mutating `_select[type]` (or the Math.max clamp in
`keyupHandler`) also corrupted the immutable `_current` start position
and the 'current' grid highlight could drift. Give `_select` its own
shallow clone (ICheckerCount is a flat { row, column }). No code relies
on `_current === _select` identity — render() destructures each
separately and mouseenter reassigns `_select` to a fresh object.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* test(muya): tear down table picker floats between specs

The tableChessboard suite builds real BaseFloat instances, which append a
floatBox to <body>, run floating-ui autoUpdate, and observe their
container with a ResizeObserver. `afterEach` only restored mocks, so
those listeners/observers/nodes leaked across specs. Call
`picker.destroy()` (BaseFloat unobserves the ResizeObserver, runs the
autoUpdate cleanup, and removes its floatBox) and detach the host /
reference nodes the fakes appended to <body>, so nothing leaks into the
next spec.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Persist the migration TODO / decision log under .claude/ on develop as the
record of the desktop editor engine migration: public-API build-out (phases
A–C), the one-shot desktop swap (D), theme migration (E), test cleanup (F),
the per-feature verification audit (G, 8 real bugs), parity 15/15, and the
table regression fixes (#4435 cross-cell selection, #4437 grid-picker
restoration). Phase H (delete packages/muyajs) is deferred to after the
0.20.0 release.

The file is force-added; the rest of .claude/ stays gitignored.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>