feat: Kanban board view driven by a status property

[tstapler]

Problem

SteleKit has no board view for task/status-driven workflows. Trilium Notes' Kanban Board collection (https://docs.triliumnotes.org/user-guide/collections/kanban-board) turns a status-like property into draggable columns: dragging a card between columns updates the underlying property, columns can be added/renamed/reordered, and (optionally) columns can be grouped by a relation instead of a plain status label.

No existing project_plans/ entry covers this.

Why this matters

• Pairs naturally with the table view (feat: table/database view over page properties #228 in this repo) — same underlying "pages matching a query, with editable properties" substrate, different visual arrangement. Worth sequencing after or alongside the query executor (feat: execute {{query}} blocks as live, auto-updating results #224) and table view.
• Task/status workflows (a personal Kanban of TODOs) are one of the most common Logseq/Roam power-user patterns; today SteleKit only supports this via flat TODO markers in outline text with no board-level overview.

Suggested scope (v1)

• Board over a tag/query, grouped by a status-like property (default property name configurable, e.g. status).
• Column = distinct status value; drag a card between columns to update that page's property.
• Add/rename/delete columns; column reordering.
• Out of scope for v1: grouping by relation/link target instead of a plain property value, custom per-card attribute badges, cross-column bulk drag.

References

• Depends conceptually on the live-query work in feat: execute {{query}} blocks as live, auto-updating results #224 and pairs with the table view in feat: table/database view over page properties #228
• No existing project_plans/ entry covers this