Hide empty testing batches in changelog

AGENTS.md

@@ -44,6 +44,7 @@ The app shows its version number and a player-facing changelog in the ☰ menu
 
 - Ordinary commits do **not** bump `VERSION` or the Nix package versions.
 - Accumulate player-visible changes in one entry at the **top** of `CHANGELOG` with `version: null` and `changes: [...]`. The About dialog labels it **In testing**. Append to or consolidate this batch across commits; do not create a separate entry per commit or assign a release date yet.
+- Omit the In testing entry when there are no unreleased player-facing changes; empty batches are hidden. Do not add placeholder entries just to describe changelog maintenance.
 - The changelog is for players: skip refactors, tests, tooling, and other internal-only changes. Internal-only commits need no changelog entry.
 - Release labeling is a separate process, performed only when explicitly requested. At release time:
   1. Consolidate the In testing batch into meaningful player-facing groups using `groups: [{ title, changes: [...] }]`, replacing its flat `changes` list. Remove duplicates and describe the final behavior.

TODO.md

@@ -8,6 +8,8 @@
 
 ## Polish
 
+- [x] Hide In testing when there are no unreleased changes and remove the placeholder batch.
+
 - [x] Consolidate the September 4 changelog entries into one grouped version.
 
 - [x] Accumulate In testing changelog batches and reserve app/Nix version bumps for grouped releases.

frontend/src/components/AboutModal.svelte

@@ -2,6 +2,12 @@
     import { createEventDispatcher } from 'svelte';
     import { VERSION, CHANGELOG } from '../lib/changelog';
 
+    const visibleEntries = CHANGELOG.filter((entry) =>
+        entry.version !== null ||
+        (entry.groups ?? [{ changes: entry.changes ?? [] }])
+            .some((group) => group.changes.some((change) => change.trim()))
+    );
+
     const dispatch = createEventDispatcher();
     function close() { dispatch('close'); }
 </script>
@@ -17,7 +23,7 @@
 
         <h4 class="about-heading">What's New</h4>
         <ul class="changelog">
-            {#each CHANGELOG as entry (entry.version)}
+            {#each visibleEntries as entry (entry.version)}
                 <li class="changelog-entry">
                     <div class="changelog-head">
                         <span class="changelog-ver">{entry.version === null ? 'In testing' : `v${entry.version}`}</span>

frontend/src/lib/changelog.js

@@ -10,9 +10,8 @@ export const VERSION = 50;
 
 // Newest first. In testing: { version: null, changes: [string, ...] }.
 // Release: { version, date: 'YYYY-MM-DD', groups: [{ title, changes: [...] }] }.
-// Historical flat changes arrays are also supported.
+// Historical flat changes arrays are also supported. Omit the testing entry when empty.
 export const CHANGELOG = [
-    { version: null, changes: ['Upcoming changes now appear together under In testing in About, ahead of numbered releases.'] },
     {
         version: 50,
         date: '2026-09-04',