v0.3.71 - dependency auto-install, multi-target venues, bug fixes

couple things in this one:

**improvements**

- custom venue calibration now auto-installs the browser engine on first use - no manual setup step anymore

- value betting target venues support multi-select now. pick several soft venues instead of just one

- kalshi Live tab shows event names and clickable links instead of raw ticker codes

- error messages show the actual cause instead of generic 'returned 500'

- community hub 'Already have' badge checks locally now - reinstalling after a fresh start works correctly

- installing a venue from community hub opens the setup guide automatically

**fixes**

- fixed custom venues not appearing in Arena after creation

- fixed view-only toggle not taking effect until restart

- fixed polymarket credential derivation failing in compiled builds

- fixed desktop shortcut pointing to wrong executable after update

- fixed app opening in browser instead of native window on some windows PCs (missing .NET runtime auto-detected)

- fixed 'Permission denied' when launching browser on macOS