ci: add path filter to e2e workflow

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: ovitrif

.github/workflows/e2e.yml

@@ -8,6 +8,11 @@ on:
         required: false
         default: "default-feature-branch"
   pull_request:
+    paths:
+      - 'app/**'
+      - 'gradle/**'
+      - '*.gradle.kts'
+      - 'gradle.properties'
 
 env:
   TERM: xterm-256color