feat: East Africa + Southern Africa pills with regional sub-sections

- East Africa pill: merges Uganda + east-africa tags; Uganda pinned first via sub-sections
- Southern Africa pill: covers SA, Namibia, Botswana, Zimbabwe, Zambia, Mozambique; SA/Namibia/Botswana prioritized
- StoryStore.setPill now resets lastSyncedAt to bypass 30s rate-limit on filter switch
- sectionSupplement background fetch populates sparse regional sections in All digest
- SignalFeedView digestContent: flat hero+scroll path for pills without subSections (was showing max 5)
- Theme: removed standalone Uganda pill, wired new sub-section layouts

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Jarvis/JarvisApp.swift

@@ -118,6 +118,9 @@ struct JarvisApp: App {
             .task {
                 BackgroundRefreshManager.container = container
                 BackgroundRefreshManager.scheduleFeedRefresh()
+                // Pre-populate the feed from SwiftData cache before the first API
+                // fetch completes — prevents the cold-launch empty state.
+                store.bootstrap(container: container)
                 connManager.start()
                 await connManager.resolveAndActivate()
                 await notifications.bootstrap()
@@ -127,10 +130,13 @@ struct JarvisApp: App {
                 switch phase {
                 case .active:
                     store.startForegroundSync()
-                    // Refresh immediately if we've been away more than 2 minutes.
-                    if let last = store.lastSyncedAt,
-                       Date().timeIntervalSince(last) > 120 {
-                        Task { await store.loadStories(refresh: true) }
+                    // Only trigger a load if connectivity has already been resolved.
+                    // On cold launch activeHost is nil until resolveAndActivate()
+                    // completes — calling loadFeedFull() before that always throws
+                    // APIError.notConnected and leaves lastSyncedAt permanently nil.
+                    // activate() calls loadFeedFull() itself once the host is confirmed.
+                    if connManager.activeHost != nil {
+                        Task { await store.loadFeedFull() }
                     }
                 case .background:
                     store.stopForegroundSync()