feat: search matches ingredients/tags, add tag filter chips to Explore

Search previously only matched title/description. Now also matches
ingredient rawName (EXISTS subquery) and tags (unnest+ILIKE) via
sequential scan — fine at current scale, flagged for a trigram/GIN
index if it gets slow. Explore also shows the 12 most-used public
tags as clickable chips that AND-filter results via a new `tags`
query param (array containment).

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 = "0.14.0";
+export const APP_VERSION = "0.15.0";
 
 export type ChangelogEntry = {
   version: string;
@@ -11,6 +11,14 @@ export type ChangelogEntry = {
 };
 
 export const CHANGELOG: ChangelogEntry[] = [
+  {
+    version: "0.15.0",
+    date: "2026-07-13 21:54",
+    added: [
+      "**Search now matches ingredients and tags**, not just title/description — \"zaatar\" now finds a recipe that uses it even if the title doesn't mention it.",
+      "**Tag filter chips on Explore**: click a popular tag to narrow results instead of typing it.",
+    ],
+  },
   {
     version: "0.14.0",
     date: "2026-07-13 21:47",