docs(todo): magazine region ordering — manual order and column-aware reading order

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

TODO.md

@@ -64,6 +64,17 @@ not part of this order.
 
 ### P1 — next, highest user impact
 
+- [ ] **M — Magazine: let the reader decide the region order.** On the boundary-review page,
+  give each region an explicit reading position: click the regions in the order they should be
+  read, or type a number into each one. The order drives playback and the OCR-results list.
+  Today the order is whatever the layout analysis produced, and a page with two text columns
+  comes out interleaved, so a listener hears half a sentence from the wrong column.
+- [ ] **M — Magazine: read text columns top-to-bottom, then left-to-right.** Group detected text
+  regions into columns first, order each column downwards, then take the columns left to right
+  (mirroring for RTL). Confirmed wrong on page 38 of issue 204: the left column's paragraphs and
+  the right column's are mixed into one sequence. Should land before the manual ordering above,
+  which is then only a correction tool rather than routine work.
+
 - [x] **S — Re-measure audiobook segmentation against `cast_run3.json`.** Run 3 has
   2,227 segments, 1,043 dialogue segments and 585 newline-fused segments, but zero
   adjacent same-speaker dialogue pairs for `_audiobookMergeAdjacentDialogue` to merge.