test(e2e): repair desktop Appium suite after IA refactors (#3649)

.github/workflows/e2e.yml

@@ -7,7 +7,26 @@
 name: E2E
 
 on:
-  workflow_dispatch: {}
+  workflow_dispatch:
+    inputs:
+      run_linux:
+        description: Run the Linux (Xvfb / container) E2E job.
+        type: boolean
+        default: true
+      run_macos:
+        description: Run the macOS E2E job.
+        type: boolean
+        default: true
+      run_windows:
+        description: Run the Windows E2E job.
+        type: boolean
+        default: true
+      full:
+        description:
+          When true, run the entire spec suite (sharded). When false, run the
+          desktop full-flow lane only (mega-flow.spec.ts).
+        type: boolean
+        default: false
 
 permissions:
   contents: read
@@ -22,7 +41,7 @@ jobs:
   e2e-desktop:
     uses: ./.github/workflows/e2e-reusable.yml
     with:
-      run_linux: true
-      run_macos: true
-      run_windows: true
-      full: false
+      run_linux: ${{ inputs.run_linux }}
+      run_macos: ${{ inputs.run_macos }}
+      run_windows: ${{ inputs.run_windows }}
+      full: ${{ inputs.full }}