Update 066 - Roads and Rivers are easier to detail

Overworld — Update 066: Linked POIs & Flexible Segment Editing

This update adds clickable links to your points of interest and makes editing roads and rivers more flexible.

🔗 New: Links on Points of Interest
- Give any POI a clickable link — a short label (like "Wiki" or "Lore") plus a web address.
- Click the link to open it in your browser.
- Paste a bare address (e.g. example.com) and it's tidied up automatically; only real web links are accepted, so you won't save a broken one.
- Need several references on one POI? Drop extra URLs into the notes field as before — they're still detected.

🛣️ New: Edit roads & rivers across levels
- Previously a road or river segment could only be edited on the exact level where you drew it.
- Now you can adjust it from that level and any level below it — no more switching back just to tweak a segment.
- Segments still stay on their original level and the levels beneath, never above, so nothing moves where you don't expect it.

Fixes & polish
- Fixed a button that could get "stuck" after opening a link and switching back to the editor.

Thanks for playing, and keep the feedback coming!