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/Networking/APIClient.swift

@@ -68,12 +68,14 @@ actor APIClient {
     func fetchStories(
         cursor: String? = nil,
         topic: String? = nil,
+        tags: Set<String> = [],
         minSignal: Int? = nil,
         limit: Int = 20
     ) async throws -> PaginatedStories {
         var params: [String: String] = ["limit": "\(limit)"]
         if let cursor   { params["after"] = cursor }
         if let topic    { params["topic"] = topic }
+        if !tags.isEmpty { params["tags"] = tags.sorted().joined(separator: ",") }
         if let minSignal { params["min_signal"] = "\(minSignal)" }
         return try await get("/stories", params: params)
     }

Jarvis/Networking/WebSocketManager.swift

@@ -5,7 +5,7 @@ import Foundation
 import Combine
 
 enum ConnectionState {
-    case disconnected
+    case disconnected             
     case connecting
     case connected
     case reconnecting(attempt: Int)