polish: extract inline CSS, add connection status, panel macro, favicon, ollama cache, toast system (#164)

Major:
- Extract all inline <style> blocks from 22 Jinja2 templates into
  static/css/mission-control.css — single cacheable stylesheet
- Add tox lint check that fails on inline <style> in templates

Minor:
1. Connection status indicator in topbar (green/amber/red dot) reflecting
   WebSocket + Ollama reachability, with auto-reconnect
2. Jinja2 {% macro panel(title) %} in macros.html — eliminates repeated
   .card.mc-panel markup; index.html converted as example
3. SVG favicon (purple T + orange dot)
4. 30-second TTL cache on _check_ollama() to avoid blocking the event loop
   on every health poll (asyncio.to_thread was already in place)
5. Toast notification system (McToast.show) for transient status messages —
   wired into connection status for Ollama/WebSocket state changes

Enforcement:
- CLAUDE.md updated with conventions 11-14 (no inline CSS, use panel macro,
  use toasts, never block the event loop)
- tox lint + pre-push environments now fail on inline <style> blocks

https://claude.ai/code/session_014FQ785MQdyJQ4BAXrRSo9w

Co-authored-by: Claude <noreply@anthropic.com>

src/dashboard/templates/upgrade_queue.html

@@ -182,113 +182,4 @@ async function applyUpgrade(id) {
 }
 </script>
 
-<style>
-.mc-section {
-  margin-bottom: 2rem;
-}
-
-.mc-section-title {
-  display: flex;
-  align-items: center;
-  gap: 0.5rem;
-  margin-bottom: 1rem;
-}
-
-.upgrades-list {
-  display: flex;
-  flex-direction: column;
-  gap: 1rem;
-}
-
-.upgrade-card {
-  background: rgba(10, 15, 30, 0.6);
-  border: 1px solid var(--mc-border);
-  border-radius: 0.5rem;
-  padding: 1rem;
-}
-
-.upgrade-pending {
-  border-left: 4px solid #ffc107;
-}
-
-.upgrade-approved {
-  border-left: 4px solid #17a2b8;
-}
-
-.upgrade-applied {
-  border-left: 4px solid #28a745;
-}
-
-.upgrade-rejected {
-  border-left: 4px solid #6c757d;
-}
-
-.upgrade-failed {
-  border-left: 4px solid #dc3545;
-}
-
-.upgrade-header {
-  display: flex;
-  justify-content: space-between;
-  align-items: flex-start;
-  margin-bottom: 0.5rem;
-}
-
-.upgrade-header h3 {
-  margin: 0;
-  font-size: 1.1rem;
-}
-
-.upgrade-meta {
-  display: flex;
-  gap: 1rem;
-  font-size: 0.85rem;
-  color: var(--mc-text-secondary);
-  margin-bottom: 0.5rem;
-}
-
-.upgrade-files {
-  font-size: 0.9rem;
-  margin-bottom: 0.5rem;
-  font-family: monospace;
-}
-
-.upgrade-test-status {
-  margin-bottom: 0.75rem;
-}
-
-.test-passed {
-  color: #28a745;
-}
-
-.test-failed {
-  color: #dc3545;
-}
-
-.upgrade-actions {
-  display: flex;
-  gap: 0.5rem;
-}
-
-.upgrades-history .upgrade-card {
-  display: flex;
-  align-items: center;
-  gap: 1rem;
-  padding: 0.75rem 1rem;
-}
-
-.upgrade-desc {
-  flex: 1;
-}
-
-.upgrade-time {
-  font-size: 0.85rem;
-  color: var(--mc-text-secondary);
-}
-
-.upgrade-error {
-  color: #dc3545;
-  cursor: help;
-}
-</style>
 {% endblock %}