* fix(config): update default keymaps to match vimdoc
Problem: four keymap defaults in `config.lua` still used the old
deprecated keys (`!`, `D`, `U`, `F`) while `doc/pending.txt` documents
the `g`-prefixed replacements (`g!`, `gd`, `gz`, `gf`).
Solution: update `priority`, `date`, `undo`, and `filter` defaults to
`g!`, `gd`, `gz`, and `gf` respectively.
* fix(buffer): correct extmark drift on `open_line` above/below done tasks
Problem: `open_line` used `nvim_buf_set_lines` which triggered `on_bytes`
with a `start_row` offset designed for native `o`/`O` keypresses. The
`_meta` entry was inserted one position too late, causing the done task's
`PendingDone` highlight to attach to the new blank line instead.
Solution: suppress `on_bytes` during `open_line` by reusing the
`_rendering` guard, insert the meta entry at the correct position, and
immediately reapply inline extmarks for the affected rows.
* fix(buffer): infer task status from line text in `reapply_dirty_inline`
Problem: `on_bytes` inserts bare `{ type = 'task' }` meta entries with
no `status` field for any new lines (paste, undo, native edits). When
meta positions also shift incorrectly (e.g. `P` paste above), existing
meta with the wrong status ends up on the wrong row. This causes done
tasks to lose their `PendingDone` highlight and pending tasks to appear
greyed out.
Solution: always re-infer `status` from the actual buffer line text for
dirty task rows before applying extmarks. The checkbox character (`[x]`,
`[>]`, `[=]`, `[ ]`) is the source of truth, with fallback to the
existing meta status if the line doesn't match a task pattern.
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