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/messages/en.json

@@ -30,7 +30,8 @@
         "cookMode": { "title": "Hands-free cook mode", "description": "A distraction-free, step-by-step view for actually cooking — large text, timers, no scrolling with messy hands." },
         "variations": { "title": "Recipe variations", "description": "Ask for a dietary twist, an ingredient swap, or a whole new spin on a recipe — AI proposes a variation, you decide whether to keep it." },
         "social": { "title": "Share & discover", "description": "Follow other cooks, rate and comment on recipes, and control exactly who can see yours." },
-        "batchCook": { "title": "Batch cooking", "description": "Cook once, eat all week — dedicated batch-cook planning with fridge/freezer guidance." }
+        "batchCook": { "title": "Batch cooking", "description": "Cook once, eat all week — dedicated batch-cook planning with fridge/freezer guidance." },
+        "recommendations": { "title": "Personalized recommendations", "description": "A For You feed ranked from what you've favorited and rated, plus meal/drink pairing suggestions for any recipe." }
       }
     },
     "features": {