feat: Sprint 21 — mobile responsive layout + Docker support

Mobile responsive (Issue #21):
- Hamburger sidebar: slide-in overlay on mobile (<640px) with backdrop.
  Tap hamburger in topbar to open, tap outside to close. Full session
  list, project chips, all panel content accessible.
- Bottom navigation bar: 5-tab fixed bar (Chat, Tasks, Skills, Memory,
  Spaces) replaces sidebar nav tabs on mobile. iOS-style layout.
  Tapping a tab opens the sidebar overlay with that panel active.
- Right panel slide-over: Files button in topbar chips opens workspace
  panel as a slide-over from the right on mobile/tablet.
- Touch targets: all interactive elements get min 44x44px touch areas.
  Session items, approval buttons, composer buttons all sized for fingers.
- Composer positioned above bottom nav bar with proper spacing.
- Sidebar nav tabs and bottom section hidden on mobile (replaced by
  bottom nav + topbar chips).
- Clicking a session auto-closes the sidebar overlay.
- Desktop layout completely unchanged — all mobile elements are
  display:none by default, only shown inside @media(max-width:640px).

Docker (Issue #7):
- Dockerfile: python:3.12-slim, HERMES_WEBUI_HOST=0.0.0.0, port 8787.
- docker-compose.yml: named volume for state persistence, optional
  ~/.hermes mount for agent features, password env var documented.
- README: Docker quick start section with compose and manual commands.

Tests: 392 passed, 23 pre-existing failures, 0 regressions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,20 @@
+FROM python:3.12-slim
+
+LABEL maintainer="nesquena"
+LABEL description="Hermes Web UI — browser interface for Hermes Agent"
+
+WORKDIR /app
+
+# Copy source
+COPY . /app
+
+# Default to binding all interfaces (required for container networking)
+ENV HERMES_WEBUI_HOST=0.0.0.0
+ENV HERMES_WEBUI_PORT=8787
+
+# State directory (mount as volume for persistence)
+ENV HERMES_WEBUI_STATE_DIR=/data
+
+EXPOSE 8787
+
+CMD ["python", "server.py"]