Add deferred tasks backlog doc

docs/open-tasks.md

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+# Open Tasks / Deferred Ideas
+
+Purpose: collect tasks and ideas that should be implemented later so future
+sessions can pick them up without losing context.
+
+## Backlog
+
+### iOS Share Sheet Integration (Deferred)
+
+Status: `deferred`
+Priority: `high` (for real cross-app sharing UX on iPhone/iPad)
+
+Problem
+- The app does not appear in the iOS share sheet yet.
+- `receive_sharing_intent` is added in Flutter (`pubspec.yaml`), but the iOS
+  Share Extension target is not configured in the Xcode project.
+
+What is missing (current repo state)
+- No `ios/Share Extension/` target files in the project
+- No Share Extension target configured in `ios/Runner.xcodeproj/project.pbxproj`
+- No extension target block in `ios/Podfile`
+- No shared App Group capability setup for `Runner` + extension
+
+Implementation plan (later)
+1. Create iOS `Share Extension` target in Xcode.
+2. Add/port extension files based on `receive_sharing_intent` example:
+   - `Share Extension/Info.plist`
+   - `ShareViewController.swift` (inherits `RSIShareViewController`)
+   - extension entitlements file
+3. Update `ios/Runner/Info.plist` with plugin-required app group / URL scheme
+   keys.
+4. Add extension target to `ios/Podfile` (`target 'Share Extension' do ...`).
+5. Enable App Groups in both targets (`Runner` and `Share Extension`) with the
+   same group id.
+6. Verify build phase ordering (`Embed Foundation Extension` before `Thin Binary`)
+   if needed.
+7. Test text sharing from iOS Simulator apps (Notes/Safari).
+8. Test real WhatsApp/iMessage sharing on a physical iPhone (simulator is not a
+   reliable substitute for chat metadata behavior).
+
+Notes
+- The app already has an in-app fallback path for testing ingest logic:
+  `Settings` -> `Simulate WhatsApp Share`.
+- Flutter-side ingest/parsing/inbox routing is implemented; this backlog item is
+  specifically native iOS share-extension wiring.
+
+## Future Ideas (placeholder)
+
+- Add "Promote confirmed preference signal to profile tag" action
+- Add duplicate-tag conflict handling when promoting signals
+- Add graph explorer minimap / fit-to-screen controls