FN-8243: restore priority select focus-visible coverage

Restore tokenized focus styling required by dashboard CSS hygiene checks.

- Add the missing `.detail-priority-select:focus-visible` selector.
- Reuse the shared strong focus-ring and radius tokens.

Files changed:
 packages/dashboard/app/components/TaskDetailModal.css | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

Fusion-Task-Id: FN-8243

Fusion-Task-Lineage: 35d6214e-a0de-48b1-8fd7-9eb4fca707ef

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

packages/dashboard/app/components/TaskDetailModal.css

@@ -451,6 +451,22 @@ the metadata row wraps at mobile widths.
   box-shadow: var(--focus-ring-strong);
 }
 
+/*
+FNXC:TaskDetail 2026-07-17-00:00:
+FN-8243 — restore the tokenized `.detail-priority-select:focus-visible` rule
+required by css-hygiene-scan.test.ts's focus-coverage allow-list. The base
+`.detail-priority-select` styling was dropped during the FN-8209 Priority
+select→picker migration, but the hygiene allow-list still expects this
+focus-visible selector. Use `--focus-ring-strong` to match the sibling
+`.detail-oversight-select` / `.detail-priority-picker-option` focus rules;
+no raw colors so the tokenized-focus assertion stays green.
+*/
+.detail-priority-select:focus-visible {
+  outline: none;
+  box-shadow: var(--focus-ring-strong);
+  border-radius: var(--radius-sm);
+}
+
 .detail-priority-picker-option:disabled {
   cursor: wait;
 }