docs: changelog entry for the magazine dropzone

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

CHANGELOG.md

@@ -8,6 +8,11 @@ Follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) · versioned wi
 ## [Unreleased]
 
 ### 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
+  `reader-dropzone` component (same CSS, no new styling needed beyond the surrounding grid) — drag a PDF onto the
+  zone or click "Choose file", both routed through the same hidden input via a `DataTransfer` handoff so `magCreate()`
+  needed no changes. Shows the chosen/dropped filename in place of the default hint text.
 - **Magazine P1 Complete: Images, Play-All, Word Highlighting, Driving Mode.** Figures now appear automatically during
   playback — `assign_images_to_articles` links each extracted image to the article whose column it falls in (the nearer
   article's blocks decide when two share a page), and the client shows "the last image reached so far" as playback