v1.1 polish: accessibility, error logging, localization, and code quality sweep

- Wrap 30+ production print() statements in #if DEBUG guards across 18 files
- Add VoiceOver labels, hints, and traits to Watch app, Live Activities, widgets
- Add .accessibilityAddTraits(.isButton) to 15+ onTapGesture views
- Add text alternatives for color-only indicators (progress dots, mood circles)
- Localize raw string literals in NoteEditorView, EntryDetailView, widgets
- Replace 25+ silent try? with do/catch + AppLogger error logging
- Replace hardcoded font sizes with semantic Dynamic Type fonts
- Fix FIXME in IconPickerView (log icon change errors)
- Extract magic animation delays to named constants across 8 files
- Add widget empty state "Log your first mood!" messaging
- Hide decorative images from VoiceOver, add labels to ColorPickers
- Remove stale TODO in Color+Codable (alpha change deferred for migration)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Shared/Services/FoundationModelsInsightService.swift

@@ -7,6 +7,7 @@
 
 import Foundation
 import FoundationModels
+import os.log
 
 /// Error types for insight generation
 enum InsightGenerationError: Error, LocalizedError {
@@ -244,9 +245,7 @@ class FoundationModelsInsightService: ObservableObject {
             return insights
         } catch {
             // Log detailed error for debugging
-            print("❌ AI Insight generation failed for '\(periodName)': \(error)")
-            print("   Error type: \(type(of: error))")
-            print("   Localized: \(error.localizedDescription)")
+            AppLogger.ai.error("AI Insight generation failed for '\(periodName)': \(error)")
 
             lastError = .generationFailed(underlying: error)
             throw lastError!