fix: Admin Insights page could crash on a single query failure (v0.55.2)

Two changes:
1. Replaced positional `GROUP BY 1` (not used anywhere else in this
   codebase) with the conventional pattern of repeating the actual
   grouped expression — matches every other groupBy call site in the app.
2. Switched Promise.all -> Promise.allSettled across the six independent
   aggregate queries feeding the six charts, defaulting a failed one to
   an empty array (that chart just renders "No data yet") instead of
   taking the whole page down. Logs the failure server-side either way.

Couldn't reproduce locally (no DB in this sandbox), but confirmed the
allSettled path works: the production build itself hit a real connection
failure against the (absent) local DB and degraded cleanly instead of
crashing, which is exactly the resilience this fixes.

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

apps/web/lib/changelog.ts

@@ -1,5 +1,5 @@
 // Mirrors CHANGELOG.md at the repo root — update both together.
-export const APP_VERSION = "0.55.1";
+export const APP_VERSION = "0.55.2";
 
 export type ChangelogEntry = {
   version: string;
@@ -11,6 +11,13 @@ export type ChangelogEntry = {
 };
 
 export const CHANGELOG: ChangelogEntry[] = [
+  {
+    version: "0.55.2",
+    date: "2026-07-19 18:20",
+    fixed: [
+      "Admin Insights page could 500 the whole panel if any one of its six aggregate queries failed — replaced a non-standard positional GROUP BY with the same expression-repeat pattern used everywhere else in the codebase, and made the six queries independent (Promise.allSettled) so one failing degrades that one chart instead of crashing the page.",
+    ],
+  },
   {
     version: "0.55.1",
     date: "2026-07-19 18:05",