Flowdepth Beta

Automated beta build from the develop branch at commit 86b5c81.

Platforms: Windows x64, Linux x64, and universal macOS. The application binary remains named flowsurface for upstream compatibility.

This is experimental beta software. Back up important layouts before updating; regressions may occur.

Changes since `develop-55ce9a3`

86b5c81 Merge branch 'main' into develop
12b029c Tick labelling overhaul (flowsurface-rs#136)
3df72f8 cache market metadata for faster app startup - added as a opt-in checkbox to settings modal - when selected, metadata will persisted to a json and read on startup instead of redundantly refetching an almost always the same result data - modified icon pack to include a "refresh now" button for this caching feature
4836bff harden state file persistence - FLOWSURFACE_DATA_PATH now joins the file name instead of ignoring it, so all files land one level below the env root (state/log/market data no longer collide). Existing files at the old root location won't be picked up. - also writes state via temp file + rename, so the previous good state survives a crash or partial write