refactor: rebrand from Share Timer to Coffee Timer

- Update application name and branding across all files
- Rename package from share-timer to coffee-timer
- Update PWA manifest and metadata with new branding
- Update translations (EN/JA) for Coffee Timer identity
- Update documentation (DESIGN.md, README.md, claudedocs)
- Change notification tags to coffee-timer-notification
- Update script references and configuration files

This comprehensive rebranding maintains all existing functionality
while updating the application identity to better reflect its purpose
as a coffee timer application.

Modified files:
- Code: lib/notifications/notificationManager.ts
- Config: package.json, app/manifest.ts, app/[locale]/layout.tsx
- Translations: messages/en.json, messages/ja.json
- Docs: DESIGN.md, README.md, 8 claudedocs files
- Scripts: scripts/generate-icons.sh

Author: ryota-murakami

DESIGN.md

@@ -1,4 +1,4 @@
-# Share Timer
+# Coffee Timer
 
 シンプルで癒やしのタイマーアプリケーション / Simple and Relaxing Timer Application
 

README.md

@@ -8,21 +8,30 @@ import '../globals.css'
 
 export const metadata: Metadata = {
   title: {
-    default: 'Share Timer',
-    template: '%s | Share Timer',
+    default: 'Coffee Timer',
+    template: '%s | Coffee Timer',
   },
-  description: 'Simple, relaxing timer application with web push notifications. Perfect for productivity and focus sessions.',
-  keywords: ['timer', 'productivity', 'focus', 'pomodoro', 'time management', 'web app'],
-  authors: [{ name: 'Share Timer Team' }],
-  creator: 'Share Timer',
-  publisher: 'Share Timer',
+  description:
+    'Simple, relaxing coffee timer application with web push notifications. Perfect for productivity and focus sessions.',
+  keywords: [
+    'timer',
+    'productivity',
+    'focus',
+    'pomodoro',
+    'time management',
+    'web app',
+    'coffee',
+  ],
+  authors: [{ name: 'Coffee Timer Team' }],
+  creator: 'Coffee Timer',
+  publisher: 'Coffee Timer',
   formatDetection: {
     telephone: false,
   },
   appleWebApp: {
     capable: true,
     statusBarStyle: 'default',
-    title: 'ShareTimer',
+    title: 'CoffeeTimer',
     startupImage: [
       {
         url: '/apple-touch-icon.png',
@@ -56,7 +65,7 @@ export const metadata: Metadata = {
     'mobile-web-app-capable': 'yes',
     'apple-mobile-web-app-capable': 'yes',
     'apple-mobile-web-app-status-bar-style': 'default',
-    'apple-mobile-web-app-title': 'ShareTimer',
+    'apple-mobile-web-app-title': 'CoffeeTimer',
   },
 }
 
@@ -72,7 +81,7 @@ export function generateStaticParams() {
 }
 
 const isSupportedLocale = (
-  value: string
+  value: string,
 ): value is (typeof routing.locales)[number] =>
   routing.locales.some((supportedLocale) => supportedLocale === value)
 

app/[locale]/layout.tsx

@@ -2,9 +2,10 @@ import type { MetadataRoute } from 'next'
 
 export default function manifest(): MetadataRoute.Manifest {
   return {
-    name: 'Share Timer',
-    short_name: 'ShareTimer',
-    description: 'Simple, relaxing timer application with web push notifications',
+    name: 'Coffee Timer',
+    short_name: 'CoffeeTimer',
+    description:
+      'Simple, relaxing coffee timer application with web push notifications',
     start_url: '/',
     scope: '/',
     display: 'standalone',
@@ -50,14 +51,14 @@ export default function manifest(): MetadataRoute.Manifest {
         sizes: '1280x720',
         type: 'image/png',
         form_factor: 'wide',
-        label: 'Share Timer - Desktop View',
+        label: 'Coffee Timer - Desktop View',
       },
       {
         src: '/screenshots/mobile-narrow.png',
         sizes: '375x812',
         type: 'image/png',
         form_factor: 'narrow',
-        label: 'Share Timer - Mobile View',
+        label: 'Coffee Timer - Mobile View',
       },
     ],
     shortcuts: [

app/manifest.ts

@@ -186,7 +186,7 @@ Route (app)                              Size  First Load JS
 ## 📁 File Structure
 
 ```
-share-timer/
+coffee-timer/
 ├── app/
 │   ├── globals.css          # Tailwind imports
 │   ├── layout.tsx           # Root layout

claudedocs/IMPLEMENTATION_PHASE1.md

@@ -240,7 +240,7 @@ Route (app)                              Size  First Load JS
 ## 📁 File Structure Added
 
 ```
-share-timer/
+coffee-timer/
 ├── lib/
 │   ├── audio/
 │   │   └── audioManager.ts      # Audio playback manager

claudedocs/IMPLEMENTATION_PHASE2.md

@@ -149,8 +149,8 @@ Added `Notifications` section with complete translations:
 
 ```typescript
 {
-  name: 'Share Timer',
-  short_name: 'ShareTimer',
+  name: 'Coffee Timer',
+  short_name: 'CoffeeTimer',
   description: 'Simple, relaxing timer...',
   display: 'standalone',
   background_color: '#F9FAFB',
@@ -200,7 +200,7 @@ Notifications are displayed via Service Worker postMessage API rather than direc
 ## File Structure
 
 ```
-share-timer/
+coffee-timer/
 ├── app/
 │   ├── manifest.ts                      # PWA manifest (NEW)
 │   └── [locale]/

claudedocs/IMPLEMENTATION_PHASE4.md

@@ -2,7 +2,7 @@
 
 ## Summary
 
-Successfully implemented comprehensive PWA features, icon generation system, and accessibility improvements for the Share Timer application.
+Successfully implemented comprehensive PWA features, icon generation system, and accessibility improvements for the Coffee Timer application.
 
 ## Key Components
 
@@ -54,12 +54,12 @@ Successfully implemented comprehensive PWA features, icon generation system, and
 
 ```typescript
 export const metadata: Metadata = {
-  title: 'Share Timer',
+  title: 'Coffee Timer',
   description: 'Simple, relaxing timer application with web push notifications',
   appleWebApp: {
     capable: true,
     statusBarStyle: 'default',
-    title: 'ShareTimer',
+    title: 'CoffeeTimer',
   },
   icons: {
     icon: [
@@ -434,7 +434,7 @@ pnpm build
 
 ## Conclusion
 
-Phase 5 successfully transforms Share Timer into a production-ready Progressive Web App with comprehensive accessibility support. The application now:
+Phase 5 successfully transforms Coffee Timer into a production-ready Progressive Web App with comprehensive accessibility support. The application now:
 
 - Installs like a native app on all major platforms
 - Meets WCAG 2.1 AA accessibility standards

claudedocs/IMPLEMENTATION_PHASE5.md

@@ -24,7 +24,7 @@ Use this checklist to validate PWA installation and accessibility after deployin
 
 - [ ] Favicon shows in browser tab
 - [ ] App icon in OS launcher is clear and recognizable
-- [ ] About/Info shows correct app name "Share Timer"
+- [ ] About/Info shows correct app name "Coffee Timer"
 
 ### Functionality
 
@@ -257,9 +257,9 @@ pnpm test:a11y
 
 ### Tested By
 
-- Name: ******\_\_\_******
-- Date: ******\_\_\_******
-- Browser/Device: ******\_\_\_******
+- Name: **\*\***\_\_\_**\*\***
+- Date: **\*\***\_\_\_**\*\***
+- Browser/Device: **\*\***\_\_\_**\*\***
 
 ### Results
 

claudedocs/PWA_TESTING_CHECKLIST.md

@@ -1,10 +1,10 @@
-# Share Timer Test Plan
+# Coffee Timer Test Plan
 
 _Last updated: 2025-10-08_
 
 ## 1. Objectives
 
-- Validate that the Share Timer PWA delivers reliable countdown, notification, and audio playback functionality across supported browsers and devices.
+- Validate that the Coffee Timer PWA delivers reliable countdown, notification, and audio playback functionality across supported browsers and devices.
 - Ensure the newly sourced notification sounds are unique, normalized, and selectable within the app.
 - Provide a repeatable cadence for regression and release testing, including automated and manual coverage.