DOCX, PDF and Confluence import relied on a private EE module that was
dropped from this build, so those code paths only threw "enterprise
license" errors (DOCX/PDF) or silently did nothing (Confluence) while the
UI still presented them as working options.
- page-import-modal: drop the Word (DOCX), PDF and Confluence FileButtons
- remove the now-dead icon imports (IconFileTypeDocx, IconFileTypePdf,
ConfluenceIcon), the docx/pdf/confluence file refs and their input-reset
branches in handleFileUpload/handleZipUpload
- delete the orphaned confluence-icon.tsx component (no remaining importers)
Markdown, HTML, Notion and the generic zip upload remain unchanged.