Skip image paste when clipboard also has text

[paulwellnerbou]

Summary

• When pasting copied content from Word (and similar rich-text editors), the editor was inserting both the text and a PNG screenshot that Word puts on the clipboard alongside the text.
• The DOM paste handler in EditPage.tsx runs after CodeMirror's own paste handler (bubble phase), so e.preventDefault() could not stop CodeMirror from inserting the text first; the handler then uploaded the screenshot on top.
• Fix: if the clipboard contains text/plain or text/html alongside an image file blob, treat the image as a redundant rendering and skip the upload. Pure-image pastes (Finder, screenshot tools, "Copy Image") still upload as before.

Trade-off

• The only realistic regression is "copy a single image out of Word/Outlook," since those apps still ship HTML wrapping the image. If anyone reports it, we can tighten the heuristic by sniffing the HTML for Word-specific markers (e.g. urn:schemas-microsoft-com:office, Mso… classes) instead of any text presence.

Test plan

• Copy a paragraph from Word and paste into the editor → only text is inserted, no pasted-*.png upload.
• Copy an image via macOS screenshot (Cmd+Shift+Ctrl+4) and paste → image uploads and reference is inserted.
• Copy an image file in Finder and paste → image uploads and reference is inserted.
• Copy a region of a webpage (text + inline images) and paste → text/html is inserted by CodeMirror, no spurious uploads (images come through as <img src> in HTML, not as file blobs).

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