feat: add dashboard GUI with theme, font customization, and logo

- Add ecc_dashboard.py - Tkinter-based GUI for exploring ECC components
- Implement dark/light theme toggle in Settings tab
- Add font family and size customization
- Display project logo in header and taskbar
- Open in maximized window with native title bar
- Add 'dashboard' script to package.json
- Update README with dashboard documentation

Closes #XXX

README.md

@@ -84,6 +84,7 @@ This repo is the raw code only. The guides explain everything.
 
 ### v1.10.0 — Surface Refresh, Operator Workflows, and ECC 2.0 Alpha (Apr 2026)
 
+- **Dashboard GUI** — New Tkinter-based desktop application (`ecc_dashboard.py` or `npm run dashboard`) with dark/light theme toggle, font customization, and project logo in header and taskbar.
 - **Public surface synced to the live repo** — metadata, catalog counts, plugin manifests, and install-facing docs now match the actual OSS surface: 38 agents, 156 skills, and 72 legacy command shims.
 - **Operator and outbound workflow expansion** — `brand-voice`, `social-graph-ranker`, `connections-optimizer`, `customer-billing-ops`, `ecc-tools-cost-audit`, `google-workspace-ops`, `project-flow-ops`, and `workspace-surface-audit` round out the operator lane.
 - **Media and launch tooling** — `manim-video`, `remotion-video-creation`, and upgraded social publishing surfaces make technical explainers and launch content part of the same system.
@@ -240,6 +241,23 @@ For manual install instructions see the README in the `rules/` folder. When copy
 
 **That's it!** You now have access to 47 agents, 181 skills, and 79 legacy command shims.
 
+### Dashboard GUI
+
+Launch the desktop dashboard to visually explore ECC components:
+
+```bash
+npm run dashboard
+# or
+python3 ./ecc_dashboard.py
+```
+
+**Features:**
+- Tabbed interface: Agents, Skills, Commands, Rules, Settings
+- Dark/Light theme toggle
+- Font customization (family & size)
+- Project logo in header and taskbar
+- Search and filter across all components
+
 ### Multi-model commands require additional setup
 
 > WARNING: `multi-*` commands are **not** covered by the base plugin/rules install above.
@@ -500,6 +518,12 @@ everything-claude-code/
 |-- mcp-configs/      # MCP server configurations
 |   |-- mcp-servers.json    # GitHub, Supabase, Vercel, Railway, etc.
 |
+|-- ecc_dashboard.py  # Desktop GUI dashboard (Tkinter)
+|
+|-- assets/           # Assets for dashboard
+|   |-- images/
+|       |-- ecc-logo.png
+|
 |-- marketplace.json  # Self-hosted marketplace config (for /plugin marketplace add)
 ```