Bundle frontend with esbuild, serve fonts offline, fix dashboard

- Add esbuild bundling: JS (IIFE, minified, sourcemapped) and CSS into
  single dist/ files, replacing 15+ individual CSS links and CDN scripts
- Bundle Chart.js and ELK.js from npm instead of CDN (fully offline)
- Serve DM Sans and Orbitron fonts locally from static/fonts/
- Fix dashboard automation card stretching full width (max-width: 500px)
- Fix time_of_day condition not localized in automation cards
- Add Chrome browser tools context file for MCP testing workflow
- Update frontend context with bundling docs and Chrome tools reference

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/static/css/all.css

@@ -0,0 +1,17 @@
+/* CSS bundle entry — imports all stylesheets in correct order */
+@import './fonts.css';
+@import './base.css';
+@import './layout.css';
+@import './components.css';
+@import './cards.css';
+@import './modal.css';
+@import './calibration.css';
+@import './advanced-calibration.css';
+@import './dashboard.css';
+@import './streams.css';
+@import './patterns.css';
+@import './automations.css';
+@import './tree-nav.css';
+@import './tutorials.css';
+@import './graph-editor.css';
+@import './mobile.css';