fix: replace global GestureDetector with Listener to resolve touch in…

[vibhutomer]

Description

This PR addresses a subtle but impactful UI performance issue caused by the InactivityTracker.

Previously, the app was wrapped in a top-level GestureDetector. Because GestureDetector participates in Flutter's Gesture Arena, it actively competed with child widgets (scroll views, buttons, sliders) for touch events, which can lead to dropped inputs and scroll stuttering.

Changes Made

• Replaced GestureDetector with Listener in inactivity_tracker.dart.
• Updated the interaction callbacks to use raw OS-level pointer events (onPointerDown, onPointerMove).
• Because Listener does not enter the Gesture Arena, the app can now silently track inactivity without interfering with standard UI interactions.

Related Issue

Closes #1042

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance improvement (improves app responsiveness)

Checklist

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generate no new warnings or exceptions.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: beeb54dd-19b2-4e18-8bfc-ca56312063b9

📥 Commits

Reviewing files that changed from the base of the PR and between aef4fb6 and bff25fa.

📒 Files selected for processing (1)

• lib/utils/inactivity_tracker.dart

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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