fix(kanban): prevent column label render crash

[KattiTronics]

Summary

• Fixes Kanban dashboard render crash caused by COLUMN_LABEL being undefined in the column select-all checkbox aria-label.
• Reuses the already computed localized colLabel, matching the visible column heading and preserving the existing fallback to the raw column name.

Test Plan

• node --check plugins/kanban/dashboard/dist/index.js
• Loaded /kanban in the local dashboard and verified the board renders without console errors.
• Hermes Kanban CLI still lists boards/tasks.

Notes

This does not include Richard's local cache-bust manifest change; that was only needed to force his running browser/dashboard to stop using a stale plugin bundle after the local hotfix.

[alt-glitch]

Duplicate of #23659. Same fix for COLUMN_LABEL ReferenceError in kanban dashboard select-all checkbox. Also duplicated by #23701.

[teknium1]

Closing as already fixed on current main — plugins/kanban/dashboard/dist/index.js:1901 already reads \Select all tasks in ${colLabel || props.column.name}``, which is exactly your proposed change. The bundle was regenerated from source between when you opened this PR and now. Thanks for spotting and fixing the issue — your contribution was the reason it landed.