feat(publish): the Publish sheet lists the tag names a release sends (ADR 0019)

Before Publish, the sheet shows the names of the tags that go with the
release, which the instance learns, sorted, or that none go; none where
they can't be had, as something in the tree is private (the short
reading of 22 Oct, finding 5). In English and German.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/learn/halkyon_learn_flutter/lib/l10n/app_en.arb

@@ -2439,6 +2439,9 @@
   "studysetReadableBody": "Everything in it is decrypted and synced again, so the instance can read it: you can publish it, and Claude can read it through the connector.",
   "studysetPrivateNoKeys": "Sign in with your password on this device to make studysets private.",
   "studysetPrivateSomeLocked": "Some of it couldn't be opened on this device and stayed as it was.",
+  "publishTagsSent": "The names of the tags that go with it, which the instance learns: {names}",
+  "@publishTagsSent": {"placeholders": {"names": {"type": "String"}}},
+  "publishTagsSentNone": "No tags go with it.",
   "studysetLockedTitle": "Locked",
   "studysetLockedBody": "This studyset is private, and its key doesn't open on this device: it was encrypted with keys your account no longer has. It can only be deleted.",
   "studysetVisibilityPartly": "Private, partly readable",