I can format columns

docs/DataGrid Formatting DSL.md

@@ -1403,6 +1403,8 @@ These warnings would be non-blocking (DSL still parses) but displayed with a dif
 3. ~~**Translate lark grammar to Lezer**~~ Done (`lark_to_lezer.py`)
 4. ~~**Build CodeMirror extension**~~ Done (`DslEditor.py` + `initDslEditor()`)
 5. ~~**Integrate with DataGrid** - connect DSL output to formatting engine~~ Done
+   - `DataGridFormattingEditor.on_content_changed()` dispatches rules to column/row/cell formats
+   - `DataGrid.mk_body_cell_content()` applies formatting via `FormattingEngine`
 6. ~~**Implement dynamic client-side completions**~~ Done
    - Engine ID: `DSLDefinition.get_id()` passed via `completionEngineId` in JS config
    - Trigger: Hybrid (Ctrl+Space + auto after `.` `(` `"` and space)

docs/DataGrid Formatting.md

@@ -17,7 +17,8 @@
 | `row` parameter (column-level conditions) | :x: Not implemented | |
 | Column reference in value `{"col": "..."}` | :white_check_mark: Implemented | |
 | **DataGrid Integration** | | |
-| Integration in `mk_body_cell_content()` | :x: Not implemented | |
+| Integration in `mk_body_cell_content()` | :white_check_mark: Implemented | `DataGrid.py` |
+| DataGridFormattingEditor | :white_check_mark: Implemented | `DataGridFormattingEditor.py` |
 | DataGridsManager (global presets) | :white_check_mark: Implemented | `DataGridsManager.py` |
 | **Tests** | | `tests/core/formatting/` |
 | test_condition_evaluator.py | :white_check_mark: ~45 test cases | |
@@ -537,4 +538,4 @@ All items below are :x: **not implemented**.
 - **API source for enum**: `{"type": "api", "value": "https://...", ...}`
 - **Searchable enum**: For large option lists
 - **Formatter chaining**: Apply multiple formatters in sequence
-- **DataGrid integration**: Connect `FormattingEngine` to `DataGrid.mk_body_cell_content()`
+- ~~**DataGrid integration**: Connect `FormattingEngine` to `DataGrid.mk_body_cell_content()`~~ Done