P2 Stream E: FeatureComparisonScreen (replaces FeatureComparisonDialog)

Full-screen feature comparison matching iOS FeatureComparisonView.
Two-column table, iOS-equivalent row set, CTA to upgrade flow.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

composeApp/src/commonMain/kotlin/com/tt/honeyDue/navigation/Routes.kt

@@ -21,6 +21,11 @@ object ResidencesRoute
 @Serializable
 object AddResidenceRoute
 
+// Full-screen join-via-share-code flow (P2 Stream F — replaces
+// the old JoinResidenceDialog). Matches iOS JoinResidenceView.
+@Serializable
+object JoinResidenceRoute
+
 @Serializable
 data class EditResidenceRoute(
     val residenceId: Int,