changelog: Describe changes since 0.0.30

Author: gnprice

docs/changelog.md

@@ -2,6 +2,37 @@
 
 ## Unreleased
 
+This is a preview beta, including some experimental changes
+not yet merged to the main branch.
+
+
+### Highlights for users
+
+We're nearing ready to have this new app replace the legacy
+Zulip mobile app, next week.
+
+In addition to all the features in the last beta:
+* Conversations open at your first unread message. (#80)
+* TeX support now enabled by default, and covers a larger
+  set of expressions.  More to come later. (#46)
+* Numerous small improvements to the newest features:
+  muted users (#296), start a DM thread (#127),
+  recover failed send (#1441), open mid-history (#82).
+
+
+### Highlights for developers
+
+* Resolved in main: #1540, #385, #386, #127
+
+* Resolved in the experimental branch:
+  * #82 via PR #1566
+  * #80 via PR #1517
+  * #1441 via PR #1453
+  * more toward #46 via PR #1452
+  * further toward #46 via PR #1559
+  * #1147 via PR #1379
+  * #296 via PR #1561
+
 
 ## 0.0.30 (2025-05-28)