Editions become changeable — losslessly

Eric hit a diff version-disagreement and found there was no way to
revisit a set edition: the Titles pick-edition button only appeared
while the version was UNSET. It now shows as "change edition" on
version_auto/version_approved rows — and reopening the ballot no
longer clears the current pick, because change must be lossless:
abandoning the ballot keeps the approved edition, the lingering id is
inert while ambiguous (is_confident_version gates diff and upload),
and the next decision overwrites or clears it.

Help documents the other half of the disagreement story: the pipeline
NEVER edits a version already set on a BGG collection entry (the
additive-only rule), so a diff disagreement is resolved either by
changing the pipeline's pick here or by fixing the entry by hand on
BGG.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016jXZFSTZQKzAC8fqpWSz9g

data/upload_log.csv

@@ -179,3 +179,18 @@ update,291847,148198878,Mantis Falls,476820,,updated,2026-08-09T15:49:29+00:00,
 update,2058,148198880,Civilization: West Extension Map,28041,,updated,2026-08-09T15:49:34+00:00,
 update,452833,148198886,Artistry: Delightful Doorways Mini Expansion,770724,,updated,2026-08-09T15:49:39+00:00,
 update,104590,53430550,Castle Panic: The Wizard's Tower,117256,,updated,2026-08-09T15:49:45+00:00,
+add,173634,,The Red Dragon Inn 5: The Character Trove,266954,,added,2026-08-09T16:24:23+00:00,
+add,455834,,The Red Dragon Inn 10,791302,,added,2026-08-09T16:24:28+00:00,
+add,33451,,The Red Dragon Inn 2,629314,,added,2026-08-09T16:24:35+00:00,
+add,66510,,The Red Dragon Inn 3,629315,,added,2026-08-09T16:24:41+00:00,
+add,142402,,The Red Dragon Inn 4,657689,,added,2026-08-09T16:24:48+00:00,
+add,212662,,The Red Dragon Inn 6: Villains,367695,,added,2026-08-09T16:24:54+00:00,
+add,244258,,The Red Dragon Inn 7: The Tavern Crew,421810,,added,2026-08-09T16:25:02+00:00,
+add,330097,,The Red Dragon Inn 8: Pub Crawl,557415,,added,2026-08-09T16:25:08+00:00,
+add,380868,,The Red Dragon Inn 9: The Undercity,800879,,added,2026-08-09T16:25:14+00:00,
+add,302181,,The Red Dragon Inn: Allies – Evil Pooky,629307,,added,2026-08-09T16:25:20+00:00,
+add,174922,,The Red Dragon Inn: Allies – Halden the Unhinged,657858,,added,2026-08-09T16:25:27+00:00,
+add,442637,,The Red Dragon Inn: Allies – Jin vs Greppa,752778,,added,2026-08-09T16:25:32+00:00,
+add,403503,,The Red Dragon Inn: Allies – Melvyn vs. Marah,712612,,added,2026-08-09T16:25:40+00:00,
+add,125472,,The Red Dragon Inn: Allies – Pooky,629302,,added,2026-08-09T16:25:47+00:00,
+add,168857,,The Red Dragon Inn: Allies – Wrench,657857,,added,2026-08-09T16:25:54+00:00,