fix(images): say plainly why Windows offers no Recycle Bin (#500)

Maintainer ruling (a): Windows never uses the Recycle Bin, because it deletes
files larger than the bin's capacity permanently and IFileOperation's
PreDeleteItem guard cannot detect it (native probe runs 40951037575,
40953347904). Each file in the Delete review now reads "Moving files to the
Recycle Bin isn't available on Windows: files larger than the bin's capacity
would be deleted permanently." (code windows-recycle) instead of "This drive has
no trash.", and the summary line drops its "yet": "Moving to the trash is not
available for these files; each one lists why."

py/api/image_delete.py

@@ -80,6 +80,10 @@ REASONS = {
     trash.TRASH_IN_ROOT: "This drive's trash is inside an output folder.",
     trash.LOCKED: "The file is open in another program. Close it and try again.",
     trash.FAILED: "The file could not be moved to the trash.",
+    trash.WINDOWS_RECYCLE: (
+        "Moving files to the Recycle Bin isn't available on Windows: files larger "
+        "than the bin's capacity would be deleted permanently."
+    ),
     "not-attempted": "Not attempted: the job stopped after an error.",
 }
 _PROBLEM_CODES = {