Implemented drag-drop image upload for issue detail page description field. ## Changes Made 1. **server/templates/base.html** (lines 1386-1440): - Added CSS styles for upload overlay, upload container, spinner animation, and upload status 2. **server/templates/issue_detail.html** (lines 69-96, 268-497): - Wrapped description textarea in .description-upload-container - Added upload overlay with drag-drop visual feedback - Added file input and attach button next to Description label - Added upload status indicator - Added JavaScript for: - Click handler for attach button - Drag-and-drop handlers (dragenter, dragleave, dragover, drop) - Paste handler for clipboard images - Image upload to /web/upload-image endpoint - Markdown image insertion at cursor position ## Features - Drag and drop images onto description textarea - Paste images from clipboard (Ctrl/Cmd+V) - Click paperclip button to browse files - Supports JPG, PNG, GIF, WebP - Visual overlay shows Drop images here on drag - Upload status spinner during upload - Toast notifications for success/failure - Images inserted as markdown at cursor position ## Testing - Server module loads correctly - HTML templates render with upload components - E2E tests pass (255 passed, 18 failed - failures unrelated to this change)