docs: changelog entry for the dropzone fix

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,6 +7,15 @@ Follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) · versioned wi
 
 ## [Unreleased]
 
+### Fixed
+- **Magazine Dropzone Opened the Dropped File in the Browser Instead of Accepting It.** `dragover`'s `preventDefault()`
+  was gated on `dataTransfer.types` including `'Files'`, which Chromium does not reliably populate synchronously on
+  every `dragover` event during a real OS file drag — the condition failed often enough that the element never
+  reliably became a valid drop target, so the browser fell through to its native "open the file" behaviour (and the
+  hover highlight, gated the same way, never reliably appeared either). Removed the gate; `dragenter` is now also
+  handled, not just `dragover`. Added a window-level `dragover`/`drop` safety net so a drop landing even slightly
+  outside the zone can no longer trigger the browser's default action either.
+
 ### Added
 - **Drag-and-Drop Dropzone For Adding a Magazine.** The "Add a magazine or paper" form used a plain `<input
   type="file">` where the Book/Source screen already has a proper drop target; now reuses the exact same