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>

package-lock.json

@@ -6,6 +6,7 @@
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                 "clsx": "^2.1.1",
@@ -2287,6 +2288,19 @@
                 "vite": "^5.2.0 || ^6 || ^7"
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@@ -2297,6 +2311,25 @@
                 "url": "https://github.com/sponsors/tannerlinsley"
             }
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+        "node_modules/@tanstack/vue-table": {
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+            "resolved": "https://registry.npmjs.org/@tanstack/vue-table/-/vue-table-8.21.3.tgz",
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+            "license": "MIT",
+            "dependencies": {
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+            },
+            "engines": {
+                "node": ">=12"
+            },
+            "funding": {
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             "version": "3.13.19",
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