Ctrl+V pastes a picture copied in a browser, not its link

A browser's Copy Image puts the picture on the clipboard together with
text that only names it (the address and alt text, or Firefox's UTF-16
text/x-moz-url read as UTF-8) and an <img> HTML fragment. Ctrl+V only
looked for a picture when the text was empty, so it pasted a text box
with the link. When the text or HTML only names a picture, paste the
picture; with no picture on the clipboard the link still pastes as text.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/gaps.md

@@ -161,7 +161,7 @@ Detail in [file-format-parity.md](file-format-parity.md).
 - **Estimate:** 3–5 h. **Beta blocker.**
 
 ### Image paste fails on Windows (#1414)
-- **Evidence:** #53 is closed (PR #88 pastes an image-only clipboard as a picture); #1414 (Ctrl+V fails to paste external images on Windows) is open. From the egui 0.37 migration (#1350, v0.11.1) to 0.14.1 the desktop build left out eframe's `clipboard` feature, so egui simulated a clipboard inside the app and Ctrl+V never read the system clipboard on any platform. Fixed 2026-11-01. #1414 may have the same cause: re-test on Windows.
+- **Evidence:** #53 is closed (PR #88 pastes an image-only clipboard as a picture); #1414 (Ctrl+V fails to paste external images on Windows) is open. From the egui 0.37 migration (#1350, v0.11.1) to 0.14.1 the desktop build left out eframe's `clipboard` feature, so egui simulated a clipboard inside the app and Ctrl+V never read the system clipboard on any platform. Fixed 2026-11-01, as is a browser's Copy Image on Linux, which pasted its link because Ctrl+V preferred any text over the picture. #1414 may have either cause: re-test on Windows.
 - **Impact:** copy-paste of screenshots is a core workflow.
 - **Estimate:** 2–4 h. **Beta blocker.**