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>

shared/frontend/styles/layout/navigation.css

@@ -0,0 +1,151 @@
+/* Shared Navigation Styles - ROA2WEB */
+
+/* Slide-out Menu */
+.slide-menu {
+  position: fixed;
+  top: var(--header-height, 60px);
+  left: 0;
+  width: var(--sidebar-width, 280px);
+  height: calc(100vh - var(--header-height, 60px));
+  background: var(--color-bg, #fff);
+  border-right: 1px solid var(--color-border, #e5e7eb);
+  box-shadow: var(--shadow-lg, 0 10px 15px -3px rgba(0, 0, 0, 0.1));
+  transform: translateX(-100%);
+  transition: transform 0.3s ease;
+  z-index: var(--z-modal, 1000);
+  overflow-y: auto;
+  /* Flex container for profile section at bottom */
+  display: flex;
+  flex-direction: column;
+}
+
+.slide-menu.open {
+  transform: translateX(0);
+}
+
+/* Menu Overlay */
+.slide-menu-overlay {
+  position: fixed;
+  top: var(--header-height, 60px);
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background: rgba(0, 0, 0, 0.5);
+  opacity: 0;
+  visibility: hidden;
+  transition: all 0.3s ease;
+  z-index: var(--z-modal-backdrop, 999);
+}
+
+.slide-menu-overlay.open {
+  opacity: 1;
+  visibility: visible;
+}
+
+/* Menu Sections */
+.menu-section {
+  padding: var(--space-lg, 24px);
+  border-bottom: 1px solid var(--color-border, #e5e7eb);
+}
+
+.menu-section:last-child {
+  border-bottom: none;
+}
+
+/* Profile section at bottom */
+.menu-section.menu-profile {
+  margin-top: auto;
+  border-top: 1px solid var(--color-border, #e5e7eb);
+  border-bottom: none;
+}
+
+.menu-title {
+  font-size: var(--text-sm, 14px);
+  font-weight: var(--font-semibold, 600);
+  color: var(--color-text-secondary, #6b7280);
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  margin-bottom: var(--space-md, 12px);
+}
+
+.menu-list {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+}
+
+.menu-item {
+  margin-bottom: var(--space-xs, 4px);
+}
+
+.menu-link {
+  display: flex;
+  align-items: center;
+  gap: var(--space-sm, 8px);
+  padding: var(--space-sm, 8px) var(--space-md, 12px);
+  color: var(--color-text, #111827);
+  text-decoration: none;
+  border-radius: var(--radius-md, 6px);
+  transition: all 0.15s ease;
+  font-size: var(--text-sm, 14px);
+}
+
+.menu-link:hover,
+.menu-link.active {
+  background-color: var(--color-bg-secondary, #f9fafb);
+  color: var(--color-primary, #2563eb);
+}
+
+.menu-icon {
+  width: 18px;
+  height: 18px;
+  flex-shrink: 0;
+  font-size: 16px;
+}
+
+/* Profile Info */
+.profile-info {
+  display: flex;
+  align-items: center;
+  gap: var(--space-sm, 8px);
+  padding: var(--space-sm, 8px) var(--space-md, 12px);
+  margin-bottom: var(--space-sm, 8px);
+  font-weight: var(--font-medium, 500);
+  color: var(--color-text, #111827);
+}
+
+.profile-info i {
+  font-size: 1.25rem;
+  color: var(--color-primary, #2563eb);
+}
+
+/* Badge for menu items */
+.menu-badge {
+  margin-left: auto;
+  background: var(--color-danger, #ef4444);
+  color: white;
+  font-size: var(--text-xs, 12px);
+  font-weight: var(--font-semibold, 600);
+  padding: 2px 6px;
+  border-radius: var(--radius-full, 9999px);
+  min-width: 20px;
+  text-align: center;
+}
+
+/* Mobile Responsive */
+@media (max-width: 768px) {
+  .slide-menu {
+    width: 280px;
+  }
+
+  .menu-section {
+    padding: var(--space-md, 12px);
+  }
+}
+
+@media (max-width: 480px) {
+  .slide-menu {
+    width: 100vw;
+    max-width: 320px;
+  }
+}