feat(i18n): translate hardcoded strings across print, public recipe, and recipe management UI

Wires dozens of components and server pages to next-intl instead of hardcoded
English text, and adds a lightweight getMessages/formatMessage helper for
server components (print pages, public recipe page, cook metadata) since
next-intl/server isn't wired into this app's routing. Backfills missing
en/fr message keys that existing code already referenced but fr.json lacked.

apps/web/components/recipe/ai-generate-dialog.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { useState, useRef } from "react";
+import { useTranslations } from "next-intl";
 import { useRouter } from "next/navigation";
 import { Sparkles, Loader2, Camera, Type, Upload, X, Shuffle } from "lucide-react";
 import { toast } from "sonner";
@@ -69,6 +70,7 @@ export function AiGenerateDialog({
   open: boolean;
   onOpenChange: (open: boolean) => void;
 }) {
+  const t = useTranslations("ai.generate");
   const router = useRouter();
   const [tab, setTab] = useState<Tab>("describe");
 
@@ -122,7 +124,7 @@ export function AiGenerateDialog({
       });
       if (!res.ok) {
         const err = await res.json() as { error?: string };
-        toast.error(err.error ?? "Failed to generate recipe");
+        toast.error(err.error ?? t("error"));
         return;
       }
       const generated = await res.json() as GeneratedRecipe;
@@ -131,9 +133,9 @@ export function AiGenerateDialog({
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify({ ...generated, visibility: "private", aiGenerated: true, language }),
       });
-      if (!saveRes.ok) { toast.error("Failed to save generated recipe"); return; }
+      if (!saveRes.ok) { toast.error(t("saveError")); return; }
       const saved = await saveRes.json() as { id: string };
-      toast.success("Recipe generated! Review and edit before publishing.");
+      toast.success(t("success"));
       handleClose();
       router.push(`/recipes/${saved.id}/edit`);
     } finally {
@@ -151,13 +153,13 @@ export function AiGenerateDialog({
         body: JSON.stringify({ imageBase64: photoBase64, mimeType: photoMime }),
       });
       if (!res.ok) {
-        let msg = "Failed to analyze photo";
+        let msg = t("photoError");
         try { msg = ((await res.json()) as { error?: string }).error ?? msg; } catch { /* non-JSON body */ }
         toast.error(msg);
         return;
       }
       const { id } = await res.json() as { id: string };
-      toast.success("Recipe recognized! Review and edit before publishing.");
+      toast.success(t("photoSuccess"));
       handleClose();
       router.push(`/recipes/${id}/edit`);
     } finally {
@@ -226,7 +228,7 @@ export function AiGenerateDialog({
                 id="ai-prompt"
                 value={prompt}
                 onChange={(e) => setPrompt(e.target.value)}
-                placeholder="e.g. A creamy mushroom risotto with parmesan, serves 4, easy difficulty"
+                placeholder={t("placeholder")}
                 rows={4}
                 disabled={busy}
               />
@@ -249,7 +251,7 @@ export function AiGenerateDialog({
                 <Label>Difficulty</Label>
                 <Select value={difficulty} onValueChange={(v) => setDifficulty(v as typeof difficulty)} disabled={busy}>
                   <SelectTrigger>
-                    <SelectValue placeholder="Any" />
+                    <SelectValue placeholder={t("anyDifficulty")} />
                   </SelectTrigger>
                   <SelectContent>
                     <SelectItem value="">Any</SelectItem>