v0.10.1 — Icon Refresh

Updated all application icons to match the unified purple-to-cyan gradient theme used across Calcflux, Regex-Lab, and Home-Maintenance.

🎨 Style

• Full-bleed maskable icons (no built-in rounded corners — OS applies its own mask)
• Added icon.svg for scalable display
• Set "purpose": "any maskable" on PWA icons in manifest
• Updated theme/background colors to dark (#0F172A)
• Renamed icon files to match cross-project convention (icon-192.png, icon-512.png)
• Updated all references in service worker, notification settings, and manifest