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/tools.html

@@ -2,66 +2,7 @@
 
 {% block title %}Tools & Capabilities — Mission Control{% endblock %}
 
-{% block extra_styles %}
-<style>
-  .tools-container { max-width: 1200px; margin: 0 auto; }
-
-  .tools-header {
-    display: flex;
-    justify-content: space-between;
-    align-items: flex-start;
-    flex-wrap: wrap;
-    gap: 12px;
-    margin-bottom: 20px;
-  }
-  .tools-title {
-    font-size: 1.3rem;
-    font-weight: 700;
-    color: var(--text-bright);
-    letter-spacing: 0.08em;
-  }
-  .tools-subtitle {
-    font-size: 0.8rem;
-    color: var(--text-dim);
-    margin-top: 2px;
-  }
-  .tools-stat-box {
-    background: var(--glass-bg);
-    border: 1px solid var(--border);
-    border-radius: var(--radius-md);
-    padding: 10px 18px;
-    text-align: center;
-  }
-  .tools-stat-val {
-    font-size: 1.3rem;
-    font-weight: 700;
-    color: var(--text-bright);
-  }
-  .tools-stat-label {
-    font-size: 0.7rem;
-    color: var(--text-dim);
-    letter-spacing: 0.08em;
-  }
-
-  .tool-card {
-    height: 100%;
-  }
-  .tool-card .card-title {
-    font-size: 0.85rem;
-    letter-spacing: 0.04em;
-  }
-  .tool-card .card-text {
-    font-size: 0.8rem;
-    color: var(--text-dim);
-    line-height: 1.5;
-  }
-
-  @media (max-width: 768px) {
-    .tools-title { font-size: 1.1rem; }
-    .tools-header { flex-direction: column; }
-  }
-</style>
-{% endblock %}
+{% block extra_styles %}{% endblock %}
 
 {% block content %}
 <div class="tools-container py-3">