This commit adds full quote PDF generation functionality with per-company letterhead branding:
- Server-side PDF rendering using @react-pdf/renderer matching the sample quote layout
- In-app modal PDF viewer with print, download, and new-tab controls
- Letterhead service to fetch and apply company-specific branding (CNL/ISHERWOOD)
- ZAR currency and date formatting utilities for South African quotes
- Updated QuoteAttachment type to handle PocketBase's array-based file tokens
- Fixed PocketBase attachment URL generation in quote email card
- Removed deprecated `included_in_quote` field from QuoteItem and quotes service
- Updated quote item creation test to validate draft item logic
- Added comprehensive unit tests for PDF rendering and formatting helpers
- Added dev scripts for debugging PDF and image rendering issues
- Added sample generated PDF files for visual verification
- Updated tsconfig to exclude development scripts directory
- Added @react-pdf/renderer production dependency
- Removed JEI as a valid letterhead option per requirements
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