Implement a new "Records" mode for data entry.
- Add `RecordsNormal` and `RecordsEditing` to `AppMode` and `ModeKey` .
- `DataStore` now uses `IndexMap` and supports `sort_by_key()` to ensure
deterministic row order.
- `ToggleRecordsMode` command now sorts data and switches to
`RecordsNormal` .
- `EnterEditMode` command now respects records editing variants.
- `RecordsNormal` mode includes a new `o` keybinding to add a record row.
- `RecordsEditing` mode inherits from `Editing` and adds an `Esc` binding
to return to `RecordsNormal` .
- Added `SortData` effect to trigger data sorting.
- Updated UI to display "RECORDS" and "RECORDS INSERT" mode names and
styles.
- Updated keymaps, command registry, and view navigation to support these
new modes.
- Added comprehensive tests for records mode behavior, including sorting
and boundary conditions for Tab/Enter.
Co-Authored-By: fiddlerwoaroof/git-smart-commit (gemma-4-26B-A4B-it-UD-Q5_K_XL.gguf)
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