TableBlock: typed model classes for cells and column_settings instead of Dict[str, Any] #1938

Summary

TableBlock.rows is typed as Sequence[Sequence[Dict[str, Any]]] and column_settings as Optional[Sequence[Optional[Dict[str, Any]]]]. These could be typed model classes instead, similar to how other blocks use composition objects.

Feature request

Table cells — each cell is one of:

• raw_text: {"type": "raw_text", "text": "..."}
• rich_text: {"type": "rich_text", "elements": [...]}
• raw_number: {"type": "raw_number", "value": <number>, "text": "..."} (documented at docs.slack.dev/reference/block-kit/blocks/table-block, though client rendering support is unconfirmed)

These could be modeled as distinct classes (e.g. RawTextCell, RichTextCell) or accepted as a Union type, giving developers autocomplete and type checking instead of hand-building dicts.

Column settings — each entry has typed fields (align: "left" | "center" | "right", is_wrapped: bool) that would benefit from a model class with validation.

Current behavior

block = TableBlock(
    rows=[
        [{"type": "raw_text", "text": "Header"}],  # no type help
        [{"type": "raw_text", "txt": "typo"}],      # no validation
    ],
    column_settings=[{"align": "right", "is_wrapped": True}],  # untyped
)

Expected behavior

block = TableBlock(
    rows=[
        [RawTextCell(text="Header")],       # typed, validated
        [RichTextCell(elements=[...])],     # autocomplete on elements
    ],
    column_settings=[ColumnSettings(align="right", is_wrapped=True)],
)

Dicts should still be accepted for backwards compatibility (Union with dict).

Reference

• Table block docs
• Node SDK equivalent issue: TableBlock types: add RawNumberElement and consider typed cell/column_settings models node-slack-sdk#2689