[karlitschek]

New watchOS app (watchOS 10+, TalkWatch target) embedded in the iOS app:

• Conversations of the active account with unread/mention badges, ongoing calls and last message preview
• A conversation shows its last messages and reactions
• Reply by dictation, Scribble or keyboard, or with a quick reply (👍, OK, Thanks!, On my way, I'll call you later)
• Tap a message to react, opening a conversation marks it as read

The watch has no account of its own and never gets credentials. The iPhone sends the conversations via WatchConnectivity (application context, updated when rooms change) and does all server requests for it (WatchSessionController), waking up in the background if needed. Sensitive conversations show no preview. Incoming calls already reach the watch through CallKit, where they can be declined. Message ids are exchanged as Int64, as Int is 32 bit on watch hardware (arm64_32).

Reuses AppIcon.icon and Localizable.strings of the iOS app. Debug builds accept -TalkWatchSampleData and -TalkWatchOpenSampleConversation to try the app in the simulator without a paired iPhone. TalkWatch/** was added to the paths of the build workflow.

Notes

• Based on feat: Widgets, Spotlight, haptics, double tap reactions and thermal aware calls #2788 (widgets, haptics, double tap reactions, thermal aware calls). GitHub retargets this PR to main once feat: Widgets, Spotlight, haptics, double tap reactions and thermal aware calls #2788 is merged.

• Part of a set of independent feature PRs, each can be reviewed, merged or dropped on its own. Where several of them add a switch to Settings, the later one needs a trivial rebase.

• ⚠️ Needs a new App ID com.nextcloud.Talk.watchkitapp (and provisioning profile) before release builds can be signed.

• Branded builds: set WATCH_COMPANION_APP_BUNDLE_IDENTIFIER and the bundle id of the TalkWatch target.

• Also contains a commit letting Xcode sort the widget entries of the project file (same commit in the controls/widgets PR).

Testing

• App and all extensions build for the simulator (Xcode 27.1)
• Watch app builds for the watchOS simulator and runs there with sample data; built for arm64 + arm64_32 in the Release device build
• New unit test UnitWatchModelsTest
• The combined branch with all features also builds in Release for generic/platform=iOS (iPhone, iPad, Mac "Designed for iPad") and for watchOS hardware
• Not yet tried by hand with a real account and device, hence the draft.

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