v0.1.32 - Mix Calculator search, ingredient categories, throughput tidy-up

- Mix Calculator: searchable Mix Name picker (mirrors Throughput search)
- Ingredients Editor: add manual Category column; used to order Mix Calculator output
- Mix Calculator: surface formula-only mixes (no product yet) via -mix_id sentinel
- Throughput: remove unused For order / For stock destination controls from composer
- Editor change history: show timestamps in local time (stored UTC) instead of raw UTC

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/lib/changelog.ts

@@ -17,6 +17,14 @@ export type ChangelogEntry = {
 export const APP_VERSION: string = packageInfo.version;
 
 export const changelog: ChangelogEntry[] = [
+  {
+    version: '0.1.32',
+    date: '2026-06-21',
+    highlights: [
+      'App: Mix Calculator & Ingredients improvements.',
+      'App: Bug fixes & improvements.'
+    ]
+  },
   {
     version: '0.1.31',
     date: '2026-06-18',