fix(ci): use USERPROFILE and add rustup toolchain bin to PATH

The rustup shim at .cargo\bin\cargo.exe was failing with
"No application is associated with the specified file for
this operation" — a Windows error indicating the shim proxy
could not resolve the toolchain. Fix by also adding the
actual stable toolchain bin dir to PATH, bypassing the shim.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -89,7 +89,13 @@ jobs:
           # Retry transient network errors before failing.
           CARGO_NET_RETRY: '5'
         run: |
-          $env:PATH = "C:\Users\$env:USERNAME\.cargo\bin;$env:PATH"
+          # USERPROFILE is set by Windows directly; more reliable than C:\Users\$USERNAME
+          $env:PATH = "$env:USERPROFILE\.cargo\bin;$env:PATH"
+          # Also add the actual toolchain bin to bypass rustup shim execution issues
+          $toolchain = Get-ChildItem "$env:USERPROFILE\.rustup\toolchains" -Directory -ErrorAction SilentlyContinue |
+                       Where-Object { $_.Name -match 'stable' } | Select-Object -First 1
+          if ($toolchain) { $env:PATH = "$($toolchain.FullName)\bin;$env:PATH" }
+          Write-Host "cargo: $((Get-Command cargo -ErrorAction SilentlyContinue).Source)"
           cargo --version
           npm run tauri -- build --bundles nsis