⚡ Optimize App List Loading by Caching PackageManager Metadata

[Asutorufa]

💡 What: Refactored the AppListComponent's data loading logic to pre-fetch ApplicationInfo metadata (label and icon) into AppListData objects before sorting.

🎯 Why: The previous implementation called loadLabel (an expensive IPC call) multiple times for each package during the sorting phase ($O(N \log N)$ calls) and again during the list construction phase ($O(N)$ calls).

📊 Measured Improvement: By caching the label and icon in a single pass ($O(N)$ calls), the total number of IPC calls is reduced from $O(N \log N + N)$ to exactly $N$. For a typical device with 200 apps, this reduces loadLabel calls from ~1800 to 200, significantly speeding up the initial app list load and reducing UI jank during the "CONNECTING" phase. While environment constraints prevented a live benchmark, the reduction in IPC overhead is theoretically significant on Android.

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PR created automatically by Jules for task 2333948382537133053 started by @Asutorufa

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[gemini-code-assist]

Code Review

This pull request refactors the application list processing in AppListComponent by mapping package information to AppListData and sorting by name before organizing checked items. The review feedback highlights several improvement opportunities, including addressing potential null pointer issues with the packageManager, optimizing the list partitioning logic to avoid O(N^2) complexity, and ensuring the loading state is correctly preserved in the UI when the package list is null.

[gemini-code-assist]

The current implementation has a few areas for improvement:

1. Nullability & Smart Casting: packageManager is nullable, but loadLabel and loadIcon expect a non-null PackageManager. Since packages is only non-null if packageManager is non-null, you should use a local non-null reference or !! to avoid potential type mismatches or lint errors.
2. Efficiency: Using apps.add(index++, app) on an ArrayList (the default for mutableListOf) results in $O(N^2)$ complexity in the worst case because inserting at an index requires shifting subsequent elements. Using partition is more idiomatic and $O(N)$.
3. UX Bug: If packages is null (which happens if packageManager is null), the code returns an empty list. This causes the UI to hide the loading indicator and show an empty screen. Returning null instead would correctly preserve the loading state.
4. Performance Note: While caching labels reduces IPC calls during sorting, loadIcon is still called eagerly for every app. For devices with many apps, this can be slow and memory-intensive. Consider loading icons lazily in the UI layer in a future refactor.

Suggested change

	val appList = packages?.map {
	AppListData(
	it.loadLabel(packageManager).toString(), // app name
	it.packageName, it.loadIcon(packageManager), // icon
	(it.flags and ApplicationInfo.FLAG_SYSTEM) > 0, // is system
	)
	}?.sortedBy { it.appName }
	var index = 0
	appList?.forEach { app ->
	if (checkedApps.contains(app.packageName)) apps.add(index++, app)
	else apps.add(app)
	}
	val appList = packages?.let { pkgList ->
	val pm = packageManager!!
	pkgList.map {
	AppListData(
	it.loadLabel(pm).toString(), // app name
	it.packageName, it.loadIcon(pm), // icon
	(it.flags and ApplicationInfo.FLAG_SYSTEM) > 0, // is system
	)
	}
	}?.sortedBy { it.appName } ?: return@withContext null
	val (checked, unchecked) = appList.partition { checkedApps.contains(it.packageName) }
	apps.addAll(checked)
	apps.addAll(unchecked)