Changes

• Fix SPA routing — Replace singlePageApplication with staticResources + SPA fallback to prevent API routes from being intercepted
• Fix memory calculation — Use JVM Runtime heap metrics instead of OS-level memory (was including swap)
• Responsive UI — Mobile hamburger menu with sidebar overlay, responsive grids and tables
• Heuristic units — Dashboard shows MB/GB dynamically instead of raw numbers
• Dark mode fixes — Login page text now adapts to theme
• Update checker — Automatically checks for new releases on plugin enable via GitHub API
• Logo & branding — Favicon, sidebar logo, and README logo added with build-time image optimization
• Lint fixes — Resolved biome a11y errors