Add interactive widget voting and fix warnings/bugs

Widget Features:
- Add inline voting to timeline widget when no entry exists for today
- Show random prompt from notification strings in voting mode
- Update vote widget to use simple icon style for selection
- Make stats bar full width in voted state view
- Add Localizable.strings to widget extension target

Bug Fixes:
- Fix inverted date calculation in InsightsViewModel streak logic
- Replace force unwraps with safe optional handling in widgets
- Replace fatalError calls with graceful error handling
- Fix CSV import safety in SettingsView

Warning Fixes:
- Add @retroactive to Color and Date extension conformances
- Update deprecated onChange(of:perform:) to new syntax
- Replace deprecated applicationIconBadgeNumber with setBadgeCount
- Replace deprecated UIApplication.shared.windows API
- Add @preconcurrency for Swift 6 protocol conformances
- Add missing widget family cases to switch statement
- Remove unused variables and #warning directives

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Shared/Views/MainTabView.swift

@@ -58,29 +58,27 @@ struct MainTabView: View {
             })
         })
         .onAppear(perform: {
-            switch theme {
-            case .system:
-                UIApplication.shared.windows.first?.overrideUserInterfaceStyle = .unspecified
-            case .iFeel:
-                UIApplication.shared.windows.first?.overrideUserInterfaceStyle = .unspecified
-            case .dark:
-                UIApplication.shared.windows.first?.overrideUserInterfaceStyle = .dark
-            case .light:
-                UIApplication.shared.windows.first?.overrideUserInterfaceStyle = .light
-            }
-        })
-        .onChange(of: theme, perform: { value in
-            switch theme {
-            case .system:
-                UIApplication.shared.windows.first?.overrideUserInterfaceStyle = .unspecified
-            case .iFeel:
-                UIApplication.shared.windows.first?.overrideUserInterfaceStyle = .unspecified
-            case .dark:
-                UIApplication.shared.windows.first?.overrideUserInterfaceStyle = .dark
-            case .light:
-                UIApplication.shared.windows.first?.overrideUserInterfaceStyle = .light
-            }
+            applyTheme(theme)
         })
+        .onChange(of: theme) { _, newTheme in
+            applyTheme(newTheme)
+        }
+    }
+
+    private func applyTheme(_ theme: Theme) {
+        let style: UIUserInterfaceStyle
+        switch theme {
+        case .system, .iFeel:
+            style = .unspecified
+        case .dark:
+            style = .dark
+        case .light:
+            style = .light
+        }
+
+        guard let windowScene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
+              let window = windowScene.windows.first else { return }
+        window.overrideUserInterfaceStyle = style
     }
 }