DIY improvements

[sameerasw]

This pull request introduces several UX and performance improvements across the app, focusing on enhanced haptic feedback integration, UI polish, and app icon loading optimization. The most notable changes include adding haptic feedback to various user actions, optimizing how app icons are loaded and cached for better performance, and refining UI elements for clarity and responsiveness.

Haptic Feedback Enhancements:

• Added haptic feedback when switching tabs in MainActivity, when changing carousel pages or swiping in AutomationEditorActivity, when clicking the FAB in DIYScreen, and when selecting options in the NewAutomationSheet. This provides a more tactile and responsive user experience. [1] [2] [3] [4] [5]
• Introduced a subtle haptic tick when adjusting sliders (e.g., in DimWallpaperSettingsSheet) and when swiping through carousels, further improving user interaction feedback. [1] [2]

App Icon Loading Optimization:

• Implemented an icon cache in AppUtil to prevent repeated system calls and improve performance when loading app icons. Icons are now loaded at a fixed low quality to balance performance and memory usage. [1] [2] [3] [4]

UI and Usability Improvements:

• Updated the "None" action label to use a more descriptive string resource (haptic_none) in multiple places, ensuring consistency across the UI. [1] [2]
• Improved the responsiveness of the FreezeGridUI by batching state updates on the main thread, reducing UI lag when updating frozen app states.
• Adjusted the horizontal pager in MainActivity to pre-load one page beyond the viewport for smoother transitions.

Code Quality and Maintainability:

• Simplified the ActionItem composable to gracefully handle null actions and avoid redundant code. [1] [2] [3]

Minor UI Polish:

• Removed unnecessary spacing in DimWallpaperSettingsSheet for a cleaner appearance.

These changes collectively improve the app's interactivity, performance, and maintainability.