docs(12-02): design React integration strategy for attachments

- Designed 7 component modifications with code examples
- Created uploadAttachment Redux thunk with upload state
- Defined REST helpers for upload/download (FormData handling)
- Documented WebSocket handler updates for attachment fields
- Provided complete JKChatAttachButton and JKChatMessage implementations
- Created attachmentValidation.js service with size/type checks
- Mapped all requirements to Phase 13-16 implementation sequence

REACT_INTEGRATION_DESIGN.md: 1319 lines

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Nuwan 2026-02-02 18:57:57 +05:30
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commit db12cb2f76
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