feat: enhance app linking with asset selection and validation

- Implement a new "Pick Asset" step in the manual app linking flow to allow users to select a specific APK for verification.
- Add support for downloading and verifying the selected asset's package name and signing fingerprint against the installed app.
- Update `AppsViewModel` to handle asset selection, download progress tracking, and detailed validation logic.
- Enhance GitHub URL parsing to be more robust and strictly validate the "github.com" domain.
- Refactor string resources to move hardcoded UI text into `strings.xml` for better localization support.
- Improve the "Apps" list sorting to prioritize apps with available updates.
- Update `LinkAppBottomSheet` UI with `AnimatedContent` for smoother transitions between linking steps and a new `PickAssetStep` list.

Author: rainxchzed

core/presentation/src/commonMain/composeResources/values/strings.xml

@@ -555,6 +555,9 @@
     <string name="verifying_signing_key">Verifying signing key…</string>
     <string name="package_name_mismatch">Package name mismatch: the APK is %1$s, but the selected app is %2$s</string>
     <string name="signing_key_mismatch_link">Signing key mismatch: the APK in this repository was signed by a different developer than the installed app</string>
+    <string name="select_asset_title">Select installer</string>
+    <string name="select_asset_description">Pick the APK to verify against your installed app</string>
+    <string name="download_failed">Download failed</string>
     <string name="export_apps">Export</string>
     <string name="import_apps">Import</string>
     <string name="import_apps_title">Import apps</string>
@@ -565,4 +568,16 @@
     <string name="include_pre_releases_description">Track pre-release versions when checking for updates. When disabled, only stable releases are considered.</string>
     <string name="confirm_uninstall_title">Uninstall app?</string>
     <string name="confirm_uninstall_message">Are you sure you want to uninstall %1$s? This action cannot be undone and app data may be lost.</string>
+
+    <string name="invalid_github_url">Invalid GitHub URL. Use format: github.com/owner/repo</string>
+    <string name="repo_not_found">Repository not found: %1$s/%2$s</string>
+    <string name="rate_limit_try_again">GitHub API rate limit exceeded. Try again later.</string>
+    <string name="failed_to_link">Failed to link: %1$s</string>
+    <string name="failed_to_load_apps">Failed to load installed apps</string>
+    <string name="app_linked_success">%1$s linked to %2$s/%3$s</string>
+    <string name="export_failed">Export failed: %1$s</string>
+    <string name="import_failed">Import failed: %1$s</string>
+    <string name="imported_apps_summary">Imported %1$d apps</string>
+    <string name="imported_skipped">, %1$d skipped</string>
+    <string name="imported_failed">, %1$d failed</string>
 </resources>

feature/apps/presentation/src/commonMain/kotlin/zed/rainxch/apps/presentation/AppsAction.kt

@@ -1,6 +1,7 @@
 package zed.rainxch.apps.presentation
 
 import zed.rainxch.core.domain.model.DeviceApp
+import zed.rainxch.core.domain.model.GithubAsset
 import zed.rainxch.core.domain.model.InstalledApp
 
 sealed interface AppsAction {
@@ -50,6 +51,8 @@ sealed interface AppsAction {
     data class OnRepoUrlChanged(val url: String) : AppsAction
     data object OnValidateAndLinkRepo : AppsAction
     data object OnBackToAppPicker : AppsAction
+    data class OnLinkAssetSelected(val asset: GithubAsset) : AppsAction
+    data object OnBackToEnterUrl : AppsAction
 
     // Export/Import
     data object OnExportApps : AppsAction

feature/apps/presentation/src/commonMain/kotlin/zed/rainxch/apps/presentation/AppsState.kt

@@ -4,6 +4,7 @@ import zed.rainxch.apps.domain.model.GithubRepoInfo
 import zed.rainxch.apps.presentation.model.AppItem
 import zed.rainxch.apps.presentation.model.UpdateAllProgress
 import zed.rainxch.core.domain.model.DeviceApp
+import zed.rainxch.core.domain.model.GithubAsset
 import zed.rainxch.core.domain.model.InstalledApp
 
 data class AppsState(
@@ -27,6 +28,9 @@ data class AppsState(
     val isValidatingRepo: Boolean = false,
     val repoValidationError: String? = null,
     val linkValidationStatus: String? = null,
+    val linkInstallableAssets: List<GithubAsset> = emptyList(),
+    val linkSelectedAsset: GithubAsset? = null,
+    val linkDownloadProgress: Int? = null,
     val fetchedRepoInfo: GithubRepoInfo? = null,
     // Export/Import
     val isExporting: Boolean = false,
@@ -35,17 +39,19 @@ data class AppsState(
     val appPendingUninstall: InstalledApp? = null,
 ) {
     val filteredDeviceApps: List<DeviceApp>
-        get() = if (deviceAppSearchQuery.isBlank()) {
-            deviceApps
-        } else {
-            deviceApps.filter {
-                it.appName.contains(deviceAppSearchQuery, ignoreCase = true) ||
-                    it.packageName.contains(deviceAppSearchQuery, ignoreCase = true)
+        get() =
+            if (deviceAppSearchQuery.isBlank()) {
+                deviceApps
+            } else {
+                deviceApps.filter {
+                    it.appName.contains(deviceAppSearchQuery, ignoreCase = true) ||
+                        it.packageName.contains(deviceAppSearchQuery, ignoreCase = true)
+                }
             }
-        }
 }
 
 enum class LinkStep {
     PickApp,
     EnterUrl,
+    PickAsset,
 }