v0.5.1: Design overhaul — felhom.eu branding, blue/cyan color scheme

- New color palette matching felhom.eu/controller templates (blue/cyan accent)
- Plus Jakarta Sans font, 12px border radius, accent glow on focus
- felhom.eu logo in navbar, "Powered by felhom.eu" footer
- Settings page: documentation about external vs internal Docker URLs
- Fixed version double "v" prefix display
- Cleaned up example HTML files from development

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

CHANGELOG.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## v0.5.1 (2026-02-24)
+
+### Changed
+- Design overhaul: new blue/cyan color scheme matching felhom.eu / controller templates
+- Added Plus Jakarta Sans font for consistent branding
+- Added felhom.eu logo in navigation bar
+- Added "Powered by felhom.eu" footer with tagline
+- Settings page: added documentation about external vs. internal URLs (Docker networking)
+- Settings page: URL labels now clarify they are external (browser-facing) URLs
+
+### Fixed
+- Version display showed double "v" prefix (e.g. "vv0.5.0")
+
 ## v0.5.0 (2026-02-24)
 
 ### Added