fix: revert rotation animation and add progress indicator

- Reverted rotation angle logic to continuous increment for smoother animation
- Added progress view display when switching tabs to improve UX

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: graycreate

V2er/State/DataFlow/Reducers/FeedReducer.swift

@@ -48,6 +48,7 @@ func feedStateReducer(_ state: FeedState, _ action: Action) -> (FeedState, Actio
             state.selectedTab = action.tab
             Tab.saveSelectedTab(action.tab)
             state.showFilterMenu = false
+            state.showProgressView = true
             let supportsLoadMore = action.tab.supportsLoadMore()
             state.hasMoreData = supportsLoadMore
             followingAction = FeedActions.FetchData.Start()

V2er/View/Widget/TopBar.swift

@@ -70,7 +70,7 @@ struct TopBar: View {
             .forceClickable()
             .onChange(of: store.appState.feedState.showFilterMenu) { newValue in
               withAnimation {
-                rotationAngle = newValue ? 180 : 0
+                rotationAngle += 180
               }
             }
             .onTapGesture {