🚀 New Features

🔍 Advanced POI Radius Search

Backend API: Added a new /v1/poi/ endpoint allowing radius-based POI searches (up to 50km) regardless of the current map zoom level.
Custom MVT Parser: Implemented a lightweight, zero-dependency Python MVT parser to extract POI data directly from Zoom-14 vector tiles in SQLite.
Extended Categories: Added curated POI filters for:
- 🛒 Supermarkets & Grocery
- 💊 Pharmacies
- 🏥 Hospitals & Clinics
- ⛽ Fuel Stations
- ⚡ EV Charging Stations
- 🏕️ Mountain Huts, Shelters & Campsites (with expanded OSM tag support)
Optimization: Implemented a distance-sorted tile fetcher capped at 100 tiles to ensure fast response times even with large search radii.

Reverse Geocoding: Integrated lazy-loading of addresses via the Photon server.
Dynamic Popups: POI markers now display a placeholder while fetching and update to show the full address (street, house number, city, country) upon opening.

Toolbar Carousel: Redesigned the toolbar for mobile devices (< 640px) to prevent clutter. Tools are now organized into three navigable pages:
1. Search: POI toggle and search input.
2. Map: Style selection, contours, and zoom indicator.
3. Track: GPX tools and distance measurement.
Intuitive Navigation: Added navigation arrows, page indicators (dots), and native touch-swipe support to switch between toolbar pages.
Responsive Design: Adjusted button sizes and input widths for improved usability on touch screens.

Frontend: Decoupled POI searching from queryRenderedFeatures to enable "offline" discovery of features not currently rendered in the viewport.
Backend: Optimized database queries for POI fetching using indexed SQLite lookups and TMS coordinate transforms.