feat: Add shared components, refactor stores, improve data-entry workflow

Shared Components:
- Add CompanySelector.vue and PeriodSelector.vue components
- Add AppHeader.vue and SlideMenu.vue layout components
- Add shared stores factories (companies.js, accountingPeriod.js)
- Add shared routes factories (companies.py, calendar.py)
- Add shared models (company.py, calendar.py)
- Add shared layout styles (header.css, navigation.css)

Data Entry App:
- Update CLAUDE.md with prod/test server documentation
- Improve nomenclature sync service with better error handling
- Update receipts router and CRUD operations
- Add company/period stores using shared factories
- Update App.vue layout with shared components
- Fix OCRUploadZone file handling

Reports App:
- Refactor stores to use shared factories
- Update App.vue to use shared layout components

Infrastructure:
- Replace start-data-entry.sh with separate dev/test scripts
- Add .claude/rules for authentication, backend patterns, etc.
- Add implementation plan for OCR receipt improvements
- Clean up old documentation files

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

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

data-entry-app/frontend/src/main.js

@@ -33,6 +33,7 @@ import Badge from 'primevue/badge'
 import Toolbar from 'primevue/toolbar'
 import Divider from 'primevue/divider'
 import Tooltip from 'primevue/tooltip'
+import Message from 'primevue/message'
 
 // PrimeVue styles
 import 'primevue/resources/themes/lara-light-blue/theme.css'
@@ -80,6 +81,7 @@ app.component('ProgressSpinner', ProgressSpinner)
 app.component('Badge', Badge)
 app.component('Toolbar', Toolbar)
 app.component('Divider', Divider)
+app.component('Message', Message)
 
 // Register PrimeVue directives
 app.directive('tooltip', Tooltip)