fix(kanban): filter dashboard board by selected tenant (#19817)

[teknium1]

Tenant dropdown on the Kanban dashboard now actually filters the rendered cards instead of only filtering what the API returned.

Salvage of @maciekczech's PR #19817 onto current main.

Root cause

filterTask in filteredBoard (plugins/kanban/dashboard/dist/index.js) checked assigneeFilter and search but not tenantFilter. Meanwhile the useMemo deps list didn't include tenantFilter either. Net effect: tenant-switching would update the URL's ?tenant= param on the next API fetch, but between fetches (and on the cached client-side view), cards from other tenants stayed visible.

Fix

Two one-liners in plugins/kanban/dashboard/dist/index.js:

• Add if (tenantFilter && t.tenant !== tenantFilter) return false; to filterTask.
• Add tenantFilter to the useMemo deps array.

Validation

Live browser E2E against a real dashboard with 3 tasks across 2 tenants:

Selection	Cards rendered
All tenants	alpha-task, beta-task, gamma-task (3/3)
alpha	alpha-task, gamma-task (2/2 alpha tasks; Ready badge = 2)
beta	beta-task (1/1 beta task)

Tests:

• tests/plugins/test_kanban_dashboard_plugin.py — 70 passed (68 existing + 2 new from the PR).
• New regression tests cover both the SDK Select onValueChange wiring and the tenant-aware client-side filtering.

Closes

• Closes fix(kanban): filter dashboard board by selected tenant #19817 — cherry-picked both of @maciekczech's commits onto current main; authorship preserved via rebase-merge.

[github-actions]

🔎 Lint report: hermes/hermes-26a2390d vs origin/main

ruff

Total: 0 on HEAD, 0 on base (➖ 0)

🆕 New issues: none

✅ Fixed issues: none

Unchanged: 0 pre-existing issues carried over.

ty (type checker)

Total: 7632 on HEAD, 7632 on base (➖ 0)

🆕 New issues: none

✅ Fixed issues: none

Unchanged: 4008 pre-existing issues carried over.

Diagnostics are surfaced as warnings — this check never fails the build.