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/Info.plist

@@ -5,6 +5,7 @@
 	<key>BGTaskSchedulerPermittedIdentifiers</key>
 	<array>
 		<string>com.kisani.jarvis.briefing.refresh</string>
+		<string>com.kisani.jarvis.feed.refresh</string>
 	</array>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>$(DEVELOPMENT_LANGUAGE)</string>
@@ -53,7 +54,5 @@
 	<array>
 		<string>UIInterfaceOrientationPortrait</string>
 	</array>
-	<key>UIUserInterfaceStyle</key>
-	<string>Dark</string>
 </dict>
 </plist>