Replace the old prompt()-based file upload flow with an inline drop zone.
Before: Click 'Upload Doc' → native file picker → prompt() for type →
prompt() for notes → upload. Three modal interruptions.
After: Drop a file (or click to browse) → inline form shows with type
dropdown and notes field → click Upload. Zero browser dialogs.
New component: DocumentDropZone
- Drag-and-drop with visual feedback (border color change on dragover)
- Click-to-browse fallback
- Inline type selector (advisory, email, screenshot, patch, other)
- Inline notes field
- Cancel button to dismiss without uploading
- Shows filename and size before upload
- Uses toast notifications for success/error
Removed from CVECard:
- handleFileUpload function (createElement('input') + prompt() pattern)
- uploadingFile state variable
- Upload (lucide) icon import
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