Fix PR pipeline: unit tests, heap size, and sticky QR comments

- Fix unit test Gradle commands by using multiline format
- Increase JVM heap size to 6GB (matching apps/gradle.properties)
- Restore sticky QR code comments with hidden HTML identifiers
- Remove jq dependency with pure bash URL encoding
- Configure UI tests to run automatically on PR open/sync
- Configure E2E tests to run when "Run E2E test suite" is in PR body

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: hermannakos

.github/workflows/pr-pipeline.yml

@@ -126,7 +126,7 @@ jobs:
             --parallel \
             --max-workers=4 \
             --no-daemon \
-            -Dorg.gradle.jvmargs="-Xmx4g -XX:+HeapDumpOnOutOfMemoryError" \
+            -Dorg.gradle.jvmargs="-Xmx6g -XX:+HeapDumpOnOutOfMemoryError" \
             -Dkotlin.compiler.execution.strategy=in-process \
             -Pandroid.injected.signing.store.file=$(pwd)/release.jks
 
@@ -298,7 +298,7 @@ jobs:
             --parallel \
             --max-workers=4 \
             --no-daemon \
-            -Dorg.gradle.jvmargs="-Xmx4g -XX:+HeapDumpOnOutOfMemoryError" \
+            -Dorg.gradle.jvmargs="-Xmx6g -XX:+HeapDumpOnOutOfMemoryError" \
             -Dkotlin.compiler.execution.strategy=in-process
 
   student-unit-tests:
@@ -340,7 +340,7 @@ jobs:
             --parallel \
             --max-workers=4 \
             --no-daemon \
-            -Dorg.gradle.jvmargs="-Xmx4g -XX:+HeapDumpOnOutOfMemoryError" \
+            -Dorg.gradle.jvmargs="-Xmx6g -XX:+HeapDumpOnOutOfMemoryError" \
             -Dkotlin.compiler.execution.strategy=in-process
 
   teacher-unit-tests:
@@ -382,7 +382,7 @@ jobs:
             --parallel \
             --max-workers=4 \
             --no-daemon \
-            -Dorg.gradle.jvmargs="-Xmx4g -XX:+HeapDumpOnOutOfMemoryError" \
+            -Dorg.gradle.jvmargs="-Xmx6g -XX:+HeapDumpOnOutOfMemoryError" \
             -Dkotlin.compiler.execution.strategy=in-process
 
   parent-portrait-ui-tests: