Verbatim move of the file-drop modal (~310 LOC) and its
localStorage glue (FILEDROP_LS_KEY, FileDropEntry type,
loadFileDrops, saveFileDrops) into one file. The list view that
shows these entries lives in the page; the persistence layer
travels with the writer.
- New CanaryTokens/FileDropModal.tsx (modal + LS helpers + entry type)
- FileDropModal.test.tsx covers loadFileDrops empty / round-trip /
200-row cap / malformed-JSON, plus modal title rendering, the
bypass-warning banner, and CANCEL -> onClose.
- CanaryTokens.tsx loses the inline modal + LS glue plus the
now-unused imports (useRef/X/AlertTriangle/useEscapeKey/
useFocusTrap, plus BTN_PRIMARY/BTN_GHOST/Field that only the
modals consumed).
