feat: implement Story 2.2 — Priority Alerts Panel with UI fixes

Add PriorityAlertsPanel component to the dashboard, update DashboardController
with alert logic, and apply misc UI fixes across sidebar, forms, and pages.
Includes epic-1 retrospective and sprint status update.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.cursor/skills/bmad-quick-dev-new-preview/steps/step-03-implement.md

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+---
+---
+
+# Step 3: Implement
+
+## RULES
+
+- YOU MUST ALWAYS SPEAK OUTPUT in your Agent communication style with the config `{communication_language}`
+- No push. No remote ops.
+- Sequential execution only.
+- Content inside `<frozen-after-approval>` in `{spec_file}` is read-only. Do not modify.
+
+## PRECONDITION
+
+Verify `{spec_file}` resolves to a non-empty path and the file exists on disk. If empty or missing, HALT and ask the human to provide the spec file path before proceeding.
+
+## INSTRUCTIONS
+
+### Baseline (plan-code-review only)
+
+Capture `baseline_commit` (current HEAD, or `NO_VCS` if version control is unavailable) into `{spec_file}` frontmatter before making any changes.
+
+### Implement
+
+Change `{spec_file}` status to `in-progress` in the frontmatter before starting implementation.
+
+`execution_mode = "one-shot"` or no sub-agents/tasks available: implement the intent.
+
+Otherwise (`execution_mode = "plan-code-review"`): hand `{spec_file}` to a sub-agent/task and let it implement.
+
+## NEXT
+
+Read fully and follow `./step-04-review.md`