feat: add media sync and Talk parity foundations

[veryCrunchy]

Summary

• discover Android camera, screenshot, image, video, and mixed media folders through MediaStore
• support both full-library and Android selected-media access without moving originals
• add exact-revision backup receipt and reclaim eligibility modeling
• make file sync network and power policies update real WorkManager constraints
• paginate Talk history with X-Chat-Last-Given and preserve replies, threads, reactions, edit/delete, silent, expiry, and scheduling metadata
• keep the desktop workspace shell visible on detail screens and refine launcher icon alignment

Tracking

Refs #61, #62, #107, #127, #128, #154.

Validation

• bash tools/check-repository.sh
• cargo test --locked
• ./gradlew --no-daemon :contractAcquisition:test :ui:desktopTest :androidApp:testDebugUnitTest :ui:createDistributable :androidApp:assembleDebug
• verified full-library and selected-media folder discovery on a physical Android device
• verified live Talk pagination through the beginning of a long conversation
• checked the installed launcher icon on the physical device

Progresses #61.

Progresses #62.

Progresses #107.

Progresses #127.

Progresses #128.

Progresses #154.

[Copilot]

Pull request overview

This PR lays the groundwork for Android media sync (MediaStore folder discovery + backup receipt/reclaim modeling), improves file sync policy enforcement by mapping network/power settings into WorkManager constraints, and advances Talk parity by parsing and rendering additional message metadata while refining desktop/adaptive shell behavior.

Changes:

• Add Android MediaStore-based media folder discovery (with permission gating) and expose suggestions in the offline/sync UI.
• Introduce media backup receipt + reclaim eligibility modeling, and extend file sync configuration with network/power policies persisted in snapshots.
• Expand Talk message parsing/rendering to preserve threads/replies/reactions/edit/delete/silent/expiry/scheduling metadata, and adjust desktop/adaptive root shell persistence rules.

Reviewed changes

Copilot reviewed 24 out of 30 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
ui/src/commonTest/kotlin/dev/obiente/nextcloudnative/app/TalkMessagesTest.kt	Adds tests asserting Talk metadata preservation (threads/replies/reactions/edit/silent/expiry/scheduling).
ui/src/commonTest/kotlin/dev/obiente/nextcloudnative/app/MediaBackupLedgerTest.kt	Adds unit tests for receipt-based backup status and reclaim eligibility.
ui/src/commonTest/kotlin/dev/obiente/nextcloudnative/app/FileSyncCoordinatorSnapshotTest.kt	Updates snapshot tests to include new network/power policies.
ui/src/commonTest/kotlin/dev/obiente/nextcloudnative/app/design/DesktopShellLayoutTest.kt	Adds tests for root shell persistence rules across presentations.
ui/src/commonMain/kotlin/dev/obiente/nextcloudnative/app/TalkMessages.kt	Extends Talk JSON parsing to include reactions/threads/quotes/edit/delete/silent/expiry/scheduling fields.
ui/src/commonMain/kotlin/dev/obiente/nextcloudnative/app/TalkMessageRenderModel.kt	Treats messages as deleted if the new deleted flag is set.
ui/src/commonMain/kotlin/dev/obiente/nextcloudnative/app/TalkMessageCards.kt	Renders reply previews, reactions, and footer context for Talk messages.
ui/src/commonMain/kotlin/dev/obiente/nextcloudnative/app/NextcloudPlatform.kt	Adds MediaLibrary capability, Talk metadata types, and media discovery + root-hint APIs.
ui/src/commonMain/kotlin/dev/obiente/nextcloudnative/app/NextcloudNativeApp.kt	Keeps desktop shell visible for detail screens; adjusts header layout for desktop workspace.
ui/src/commonMain/kotlin/dev/obiente/nextcloudnative/app/MediaBackupLedger.kt	Introduces LocalMediaObject/MediaBackupReceipt and backup/reclaim resolution helpers.
ui/src/commonMain/kotlin/dev/obiente/nextcloudnative/app/FileSyncPlanning.kt	Adds network/power policy enums to FileSyncConfiguration.
ui/src/commonMain/kotlin/dev/obiente/nextcloudnative/app/FileSyncCoordinatorSnapshot.kt	Persists/restores new sync configuration fields with defaults for backward compatibility.
ui/src/commonMain/kotlin/dev/obiente/nextcloudnative/app/FileSyncCenter.kt	Adds shared types for media folder discovery suggestions and support states.
ui/src/commonMain/kotlin/dev/obiente/nextcloudnative/app/FileOfflineCenterScreen.kt	Surfaces media folder suggestions, permission prompts, and config selection for sync pairs.
ui/src/commonMain/kotlin/dev/obiente/nextcloudnative/app/design/DesktopShellLayout.kt	Adds shouldUseNextcloudRootShell policy helper.
androidApp/src/test/kotlin/dev/obiente/nextcloudnative/AndroidPlatformCapabilitiesTest.kt	Tests MediaLibrary permission mapping and “selected media” access recognition.
androidApp/src/test/kotlin/dev/obiente/nextcloudnative/AndroidMediaSyncFolderDetectorTest.kt	Tests media folder suggestion ranking/classification and remote path mapping.
androidApp/src/main/kotlin/dev/obiente/nextcloudnative/AndroidPlatformCapabilities.kt	Implements MediaLibrary permissions + access checks and labels/descriptions.
androidApp/src/main/kotlin/dev/obiente/nextcloudnative/AndroidNextcloudServices.kt	Adds Talk pagination via X-Chat-Last-Given and implements media discovery + root hint support.
androidApp/src/main/kotlin/dev/obiente/nextcloudnative/AndroidMediaSyncFolderDetector.kt	Implements MediaStore scanning and suggestion building for camera/screenshots/images/videos/mixed folders.
androidApp/src/main/kotlin/dev/obiente/nextcloudnative/AndroidFileSyncScheduler.kt	Maps sync network/power policies into WorkManager constraints and updates unique periodic work policy.
androidApp/src/main/kotlin/dev/obiente/nextcloudnative/AndroidFileSyncRootPicker.kt	Supports passing an initial tree URI hint to OpenDocumentTree.
androidApp/src/main/kotlin/dev/obiente/nextcloudnative/AndroidFileSyncEngine.kt	Schedules WorkManager jobs with per-pair policies and updates schedule description text.
androidApp/src/main/AndroidManifest.xml	Declares Android 13+/14 media permissions for MediaLibrary capability.

Comments suppressed due to low confidence (1)

ui/src/commonMain/kotlin/dev/obiente/nextcloudnative/app/TalkMessageCards.kt:250

• expiresAt is parsed on TalkMessage but never added to the footer context list, so even when the footer shows, expiration status isn't rendered.

        val context = buildList {
            if (message.editedAt != null) add("Edited")
            if (message.silent) add("Silent")
            if (message.scheduledAt != null) add("Scheduled")
            if (message.isThread || message.threadId != null) {

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