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/messages/en.json

@@ -44,6 +44,10 @@
     "pairingGenerateFailed": "Failed to generate \"{name}\"",
     "pairingSaveFailed": "Failed to save \"{name}\"",
     "pairingSuccess": "Recipe generated — review before publishing",
+    "pairingBulkSuccess": "{count} recipes generated — find them in your library",
+    "cookAction": "Cook",
+    "adaptConstraintPlaceholder": "e.g. Make it vegan, lower the calories, use pantry staples only, gluten-free…",
+    "photoImportFailed": "Failed to import recipe from photo.",
     "shoppingListCreateFailed": "Failed to create list",
     "shoppingListAddFailed": "Failed to add ingredients",
     "bulkDeleted": "{count, plural, one {1 recipe deleted} other {{count} recipes deleted}}",
@@ -136,6 +140,60 @@
     "metric": "Metric",
     "imperial": "Imperial"
   },
+  "print": {
+    "footer": "Printed from Epicure",
+    "day": "Day",
+    "srv": " · {count} srv",
+    "days": {
+      "mon": "Monday",
+      "tue": "Tuesday",
+      "wed": "Wednesday",
+      "thu": "Thursday",
+      "fri": "Friday",
+      "sat": "Saturday",
+      "sun": "Sunday"
+    }
+  },
+  "publicRecipe": {
+    "publicRecipeBy": "Public recipe by",
+    "viewInLibrary": "View in your library",
+    "signUpFree": "Sign up free",
+    "logIn": "Log in",
+    "wantToSave": "Want to save this recipe?",
+    "wantToSaveDescription": "Create a free account to save recipes, scale servings, and build your own library.",
+    "getStartedFree": "Get started free"
+  },
+  "substitute": {
+    "fetchError": "Couldn't fetch substitutes.",
+    "titleFor": "Substitute for {ingredient}",
+    "substitutesFor": "Substitutes for",
+    "finding": "Finding substitutes…",
+    "noneFound": "No substitutions found."
+  },
+  "recipeChat": {
+    "sorry": "Sorry, I couldn't answer that.",
+    "error": "Something went wrong. Please try again.",
+    "suggestion1": "Can I substitute any ingredients?",
+    "suggestion2": "How do I know when it's done?",
+    "suggestion3": "Can I make this ahead of time?",
+    "suggestion4": "What can I serve with this?",
+    "ariaLabel": "Ask AI about this recipe",
+    "title": "Ask about this recipe",
+    "intro": "Ask anything about this recipe — ingredients, techniques, substitutions, timing…",
+    "inputPlaceholder": "Ask a question…"
+  },
+  "servingScaler": {
+    "servings": "Servings",
+    "reset": "Reset",
+    "aiScale": "AI Scale",
+    "scaling": "Scaling…",
+    "aiScaledNote": "AI-scaled quantities shown below"
+  },
+  "explore": {
+    "searchPlaceholder": "Search public recipes…",
+    "maxMinutes": "Max minutes",
+    "aiSearchPlaceholder": "e.g. quick weeknight dinners, Italian comfort food…"
+  },
   "common": {
     "loading": "Loading…",
     "error": "Something went wrong",
@@ -220,7 +278,8 @@
     "createFirst": "Create your first recipe",
     "resultSingular": "result",
     "resultPlural": "results",
-    "for": "for"
+    "for": "for",
+    "filterByTag": "Filter by tag…"
   },
   "recipeForm": {
     "titleLabel": "Title *",
@@ -244,6 +303,9 @@
     "ingredient": "Ingredient",
     "note": "Note",
     "addIngredient": "Add ingredient",
+    "setCover": "Set as cover",
+    "removePhoto": "Remove",
+    "expand": "Expand",
     "steps": "Steps",
     "stepPlaceholder": "Step {n}…",
     "timerSeconds": "Timer (s)",
@@ -277,6 +339,11 @@
     "noRecipes": "No recipes found",
     "addFailed": "Failed to add",
     "addedToPantry": "{count, plural, one {1 item added to pantry} other {{count} items added to pantry}}",
+    "moveToPantryFailed": "Failed to move items to pantry",
+    "aisleOther": "Other",
+    "listEmptyState": "This list is empty.",
+    "checkedCount": "{checked}/{total} checked",
+    "moveToPantry": "Move {count} to pantry",
     "listCreated": "List created",
     "days": {
       "mon": "Mon",
@@ -326,7 +393,21 @@
     "empty": "No shopping lists yet",
     "listEmpty": "Empty",
     "generated": "Generated",
-    "items": "{checked}/{total} items"
+    "items": "{checked}/{total} items",
+    "itemsChecked": "{checked}/{total} items checked",
+    "fromMealPlan": " · From meal plan",
+    "addToList": "Add to list",
+    "dialogTitle": "Add to shopping list",
+    "dialogDescription": "Add the ingredients of <strong>{title}</strong> to a shopping list.",
+    "scaledSuffix": "scaled)",
+    "loadingLists": "Loading your lists…",
+    "modeExisting": "Add to existing list",
+    "modeNew": "Create new list",
+    "listNamePlaceholder": "List name",
+    "ingredientsWillBeAdded": "{count, plural, one {1 ingredient will be added.} other {{count} ingredients will be added.}}",
+    "adding": "Adding…",
+    "addIngredients": "Add ingredients",
+    "addedCount": "{count} ingredients added to list"
   },
   "collections": {
     "title": "Collections",
@@ -345,7 +426,9 @@
     "collectionCreated": "Collection created",
     "collectionForked": "Collection forked to your library",
     "inviteSent": "Invitation sent",
-    "memberRemoved": "Member removed"
+    "memberRemoved": "Member removed",
+    "replyPlaceholder": "Reply…",
+    "commentPlaceholder": "Share your thoughts…"
   },
   "cookingMode": {
     "cooking": "Cooking",
@@ -363,6 +446,8 @@
     "enableVoice": "Enable voice control",
     "stopVoice": "Stop voice",
     "toggleIngredients": "Toggle ingredients",
+    "pageTitle": "Cooking: {title}",
+    "pageTitleFallback": "Cooking Mode",
     "shortcutsTitle": "Shortcuts & commands",
     "keyboardSection": "Keyboard",
     "voiceSection": "Voice commands",
@@ -423,8 +508,16 @@
     "redeliveryFailed": "Failed to redeliver",
     "apiKeyCreateFailed": "Failed to create API key",
     "apiKeyRevokeFailed": "Failed to revoke API key",
+    "apiKeyNamePlaceholder": "e.g. My app",
+    "webhookUrlPlaceholder": "https://example.com/webhook",
+    "webhookAdding": "Adding…",
+    "webhookAddButton": "Add webhook",
+    "modelDefaultPlaceholder": "Default",
+    "modelNamePlaceholder": "e.g. llama3.2",
     "copyFailed": "Failed to copy to clipboard",
+    "byokSaved": "{provider} key saved",
     "byokSaveFailed": "Failed to save key",
+    "byokRemoved": "{provider} key removed",
     "byokRemoveFailed": "Failed to remove key",
     "modelSaved": "Model preferences saved",
     "modelSaveFailed": "Failed to save",