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/Color+Codable.swift

@@ -10,7 +10,7 @@ import SwiftUI
 // Inspired by https://cocoacasts.com/from-hex-to-uicolor-and-back-in-swift
 // Make Color codable. This includes support for transparency.
 // See https://www.digitalocean.com/community/tutorials/css-hex-code-colors-alpha-values
-extension Color: Codable {
+extension Color: @retroactive Codable {
     init(hex: String) {
         let rgba = hex.toRGBA()
         
@@ -99,7 +99,7 @@ extension String {
     }
 }
 
-extension Color: RawRepresentable {
+extension Color: @retroactive RawRepresentable {
     // TODO: Sort out alpha
     public init?(rawValue: Int) {
         let red =   Double((rawValue & 0xFF0000) >> 16) / 0xFF