Configurable save location.
- New save-folder priority:
--outflag → app setting (saveDir) → system screenshot folder (com.apple.screencapture location) →~/Desktop - New
--choose-dirflag: opens a folder picker and stores the choice as the app's default —open -na AIShot --args --choose-dir build.shnow resets TCC permissions only when the binary actually changed (no more pointless re-granting on no-op rebuilds)