fix: replace emoji flags with SVG dropdown, complete Home's third row

Language switcher was two inline emoji-flag buttons -- emoji flag
rendering is inconsistent across OS/browsers (some render as two-letter
country codes instead of a flag). Replaced with hand-rolled inline SVG
flags (no new dependency for two locales) inside a proper dropdown
menu, trigger showing the current language's flag.

Also added a 9th Home highlight (personalized recommendations, same
copy already written for the Features page) so the lg:grid-cols-3
feature grid's last row has 3 items instead of 2.

v0.48.2

apps/web/lib/changelog.ts

@@ -1,5 +1,5 @@
 // Mirrors CHANGELOG.md at the repo root — update both together.
-export const APP_VERSION = "0.48.1";
+export const APP_VERSION = "0.48.2";
 
 export type ChangelogEntry = {
   version: string;
@@ -11,6 +11,13 @@ export type ChangelogEntry = {
 };
 
 export const CHANGELOG: ChangelogEntry[] = [
+  {
+    version: "0.48.2",
+    date: "2026-07-18 11:15",
+    fixed: [
+      "Marketing site's language switcher no longer uses emoji flags (inconsistent rendering across OS/browsers) — now inline SVG flags in a proper dropdown menu. Home page's feature grid also got a 9th highlight (personalized recommendations) so the last row isn't left half-empty.",
+    ],
+  },
   {
     version: "0.48.1",
     date: "2026-07-18 11:00",