fix(ci): refresh AppImage hashes when Cursor version is unchanged

Cursor can republish the same semver with a new build; the updater
previously skipped prefetch when the version matched, leaving stale
sha256 values. In CI, always re-prefetch and commit when flake.nix drifts.

.github/workflows/update-cursor.yml

@@ -12,9 +12,11 @@ concurrency:
 jobs:
   update-cursor:
     runs-on: ubuntu-latest
+    env:
+      CI: true
     permissions:
       contents: write
-    
+
     steps:
     - name: Checkout repository
       uses: actions/checkout@v4
@@ -65,9 +67,13 @@ jobs:
         
         # Create commit message based on version info
         if [[ "$VERSION_INFO" == completed:* ]]; then
-          # Extract version from format: completed:old_version:new_version
+          OLD_VERSION=$(echo "$VERSION_INFO" | cut -d: -f2)
           NEW_VERSION=$(echo "$VERSION_INFO" | cut -d: -f3)
-          COMMIT_MSG="Update Cursor to version $NEW_VERSION"
+          if [[ "$OLD_VERSION" == "$NEW_VERSION" ]]; then
+            COMMIT_MSG="Refresh Cursor $NEW_VERSION AppImage hashes"
+          else
+            COMMIT_MSG="Update Cursor to version $NEW_VERSION"
+          fi
         else
           COMMIT_MSG="Update Cursor to latest version"
         fi