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>

docker-compose.test.yml

@@ -39,6 +39,14 @@ services:
       - ./src:/app/src:ro
       - ./tests:/app/tests:ro
       - ./static:/app/static:ro
+      - ./hands:/app/hands:ro
+      - ./docker:/app/docker:ro
+      - ./Dockerfile:/app/Dockerfile:ro
+      - ./docker-compose.yml:/app/docker-compose.yml:ro
+      - ./docker-compose.dev.yml:/app/docker-compose.dev.yml:ro
+      - ./docker-compose.prod.yml:/app/docker-compose.prod.yml:ro
+      - ./docker-compose.test.yml:/app/docker-compose.test.yml:ro
+      - ./docker-compose.microservices.yml:/app/docker-compose.microservices.yml:ro
       - ./pyproject.toml:/app/pyproject.toml:ro
       - test-data:/app/data
     environment:
@@ -67,6 +75,7 @@ services:
     volumes:
       - ./src:/app/src:ro
       - ./static:/app/static:ro
+      - ./hands:/app/hands:ro
       - test-data:/app/data
     environment:
       DEBUG: "true"
@@ -117,6 +126,7 @@ services:
       - agents
     volumes:
       - ./src:/app/src:ro
+      - ./hands:/app/hands:ro
       - test-data:/app/data
     environment:
       COORDINATOR_URL: "http://dashboard:8000"