v1.1.0 — UI polish, group logic, and theming

• Added group-level AND/OR logic and UI toggle; persisted in saved searches/export/import
• Introduced 12‑color muted bucket themes with matching borders, halos, and pills
• Updated Boolean preview with syntax highlighting by operator
• Refined group cards (inline titles, icon controls, operator connector)
• Refreshed saved searches panel styling and inline title edits
• Updated branding (purple squirrel logo) and README badge/screenshot