fix: Docker-first test suite, UX improvements, and bug fixes (#100)

Dashboard UX:
- Restructure nav from 22 flat links to 6 core + MORE dropdown
- Add mobile nav section labels (Core, Intelligence, Agents, System, Commerce)
- Defer marked.js and dompurify.js loading, consolidate CDN to jsdelivr
- Optimize font weights (drop unused 300/500), bump style.css cache buster
- Remove duplicate HTMX load triggers from sidebar and health panels

Bug fixes:
- Fix Timmy showing OFFLINE by registering after swarm recovery sweep
- Fix ThinkingEngine await bug with asyncio.run_coroutine_threadsafe
- Fix chat auto-scroll by calling scrollChat() after history partial loads
- Add missing /voice/button page and /voice/command endpoint
- Fix Grok api_key="" treated as falsy falling through to env key
- Fix self_modify PROJECT_ROOT using settings.repo_root instead of __file__

Docker test infrastructure:
- Bind-mount hands/, docker/, Dockerfiles, and compose files into test container
- Add fontconfig + fonts-dejavu-core for creative/assembler TextClip tests
- Initialize minimal git repo in Dockerfile.test for GitSafety compatibility
- Fix introspection and path resolution tests for Docker /app context

All 1863 tests pass in Docker (0 failures, 77 skipped).

Co-authored-by: Alexander Payne <apayne@MM.local>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

static/style.css

@@ -145,6 +145,61 @@ a:hover { color: var(--orange); }
 }
 .mc-test-link:hover { border-color: var(--purple); color: var(--purple); }
 
+/* ── Named link colors ───────────────────────────── */
+.mc-link-thinking { color: #c084fc; }
+.mc-link-bugs { color: #ff6b6b; }
+.mc-link-grok { color: #00ff88; }
+
+/* ── Desktop "More" dropdown ─────────────────────── */
+.mc-nav-dropdown { position: relative; }
+.mc-dropdown-toggle {
+  background: none;
+  cursor: pointer;
+}
+.mc-dropdown-menu {
+  display: none;
+  position: absolute;
+  top: calc(100% + 6px);
+  right: 0;
+  background: rgba(17, 8, 32, 0.96);
+  backdrop-filter: blur(24px);
+  -webkit-backdrop-filter: blur(24px);
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  padding: 8px 0;
+  min-width: 160px;
+  z-index: 150;
+  max-height: 70vh;
+  overflow-y: auto;
+  flex-direction: column;
+}
+.mc-nav-dropdown:hover .mc-dropdown-menu,
+.mc-nav-dropdown.open .mc-dropdown-menu {
+  display: flex;
+}
+.mc-dropdown-menu .mc-test-link {
+  display: block;
+  padding: 6px 14px;
+  border: none;
+  border-radius: 0;
+  white-space: nowrap;
+}
+.mc-dropdown-menu .mc-test-link:hover {
+  background: rgba(124, 58, 237, 0.12);
+}
+
+/* ── Mobile section labels ───────────────────────── */
+.mc-mobile-section-label {
+  font-size: 9px;
+  font-weight: 700;
+  color: var(--text-dim);
+  letter-spacing: 0.2em;
+  padding: 12px 20px 4px;
+  text-transform: uppercase;
+  border-top: 1px solid var(--border);
+  margin-top: 4px;
+}
+
 /* ── Hamburger (mobile only) ───────────────────── */
 .mc-hamburger {
   display: none;