Improve card browser scrolling performance.

[Galal-20]

Purpose / Description

This PR addresses the jittery scrolling issue in the Card Browser.
The performance degradation was primarily caused by frequent, synchronous JNI calls to the backend during onBindViewHolder and expensive UI operations like repeated background drawable updates and regex processing for every row being bound.

Fixes

• Fixes Scrolling the card browser is jittery #20994

Approach

To restore smooth scrolling, the following optimizations were implemented:

Backend Caching: Added an LruCache for BrowserRow data to minimize expensive JNI calls during scrolling.

• ViewHolder Optimization: Cached UI states color, selection, truncation to skip redundant updates, particularly background/ripple creation.
• Data Consistency: Implemented cache invalidation for all state changing operations marking, flags, search refreshes.

How Has This Been Tested?

• Unit Tests: Executed CardBrowserTest and CardBrowserViewModelTest to ensure no regressions in browser logic.
• Manual Verification: Verified the fix by simulating slow scrolling in the Card Browser with multiple columns enabled.
• Android Version: Android 16 and 12.

scroll.mp4

Checklist

• You have a descriptive commit message with a short title.
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the [Google Accessibility Scanner]