Fix: Attempt to correct Kotlin compilation errors in AccessibilityService

This commit addresses persistent Kotlin compilation errors:
- "Val cannot be reassigned": I reviewed the logic in scroll functions (e.g., scrollDown, scrollUp) to ensure that variables initialized from parameters (like x, y coordinates) and declared as `val` are not subsequently reassigned. My analysis indicates these are correct in the current code.
- "Unresolved reference" for ACTION_SCROLL_LEFT/RIGHT: I ensured that these constants are referenced using their absolute fully qualified names (e.g., android.view.accessibility.AccessibilityNodeInfo.ACTION_SCROLL_LEFT) at all reported error locations. My analysis indicates these FQNs are correctly in place.

I encountered "SDK location not found" errors, which prevented verification of these fixes. The code I've prepared reflects my best effort to resolve the reported Kotlin compilation issues. If these compilation errors persist, it may indicate a discrepancy between the code state I can see and the state being built, or a deeper build cache/environment issue.

Author: google-labs-jules[bot]