feat: implement remaining TODO.md feature ideas + fix mobile headers

Implements the six previously-unscoped feature ideas plus a mobile
layout fix reported via screenshot:

- Mobile: Recipes/Collections/Pantry/Meal Plan/Shopping Lists headers
  now stack and wrap instead of clipping buttons on narrow viewports.
- Recipe diff/compare view: word/list diff against any past version,
  next to Restore in version history.
- Shared meal plans & shopping lists: new shoppingListMembers/
  mealPlanMembers tables (viewer/editor roles, mirrors
  collectionMembers), share dialogs, membership-checked routes.
- PDF cookbook export: /print/collection/[id] renders a whole
  collection with page breaks, using the existing print-CSS pattern
  instead of adding a PDF rendering dependency.
- Grocery delivery handoff: shopping lists can copy-as-text (works
  today) or send to Instacart once INSTACART_API_KEY is configured
  (stub adapter — real API needs a partner agreement).
- Personalized "For You" feed tab: ranks public recipes by tag/
  dietary overlap with the user's favorited/highly-rated history.
- PWA: added manifest.json + icons on top of the existing service
  worker so the app is installable; cook-mode pages were already
  cached for offline use.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

packages/db/src/index.ts

@@ -2,4 +2,4 @@ export { db } from "./client";
 export type { Db } from "./client";
 export * from "./schema";
 // Re-export query helpers so all callers use the same drizzle-orm instance
-export { eq, and, or, desc, asc, gt, lt, gte, lte, ne, inArray, isNull, isNotNull, sql, count, avg, sum, min, max, ilike, like } from "drizzle-orm";
+export { eq, and, or, desc, asc, gt, lt, gte, lte, ne, inArray, notInArray, isNull, isNotNull, sql, count, avg, sum, min, max, ilike, like } from "drizzle-orm";

packages/db/src/migrations/0014_late_marvex.sql

@@ -0,0 +1,24 @@
+CREATE TABLE "meal_plan_members" (
+	"id" text PRIMARY KEY NOT NULL,
+	"meal_plan_id" text NOT NULL,
+	"user_id" text NOT NULL,
+	"role" "collection_member_role" DEFAULT 'viewer' NOT NULL,
+	"created_at" timestamp DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE "shopping_list_members" (
+	"id" text PRIMARY KEY NOT NULL,
+	"list_id" text NOT NULL,
+	"user_id" text NOT NULL,
+	"role" "collection_member_role" DEFAULT 'viewer' NOT NULL,
+	"created_at" timestamp DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "meal_plan_members" ADD CONSTRAINT "meal_plan_members_meal_plan_id_meal_plans_id_fk" FOREIGN KEY ("meal_plan_id") REFERENCES "public"."meal_plans"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+ALTER TABLE "meal_plan_members" ADD CONSTRAINT "meal_plan_members_user_id_users_id_fk" FOREIGN KEY ("user_id") REFERENCES "public"."users"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+ALTER TABLE "shopping_list_members" ADD CONSTRAINT "shopping_list_members_list_id_shopping_lists_id_fk" FOREIGN KEY ("list_id") REFERENCES "public"."shopping_lists"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+ALTER TABLE "shopping_list_members" ADD CONSTRAINT "shopping_list_members_user_id_users_id_fk" FOREIGN KEY ("user_id") REFERENCES "public"."users"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+CREATE INDEX "meal_plan_members_plan_idx" ON "meal_plan_members" USING btree ("meal_plan_id");--> statement-breakpoint
+CREATE INDEX "meal_plan_members_user_idx" ON "meal_plan_members" USING btree ("user_id");--> statement-breakpoint
+CREATE INDEX "shopping_list_members_list_idx" ON "shopping_list_members" USING btree ("list_id");--> statement-breakpoint
+CREATE INDEX "shopping_list_members_user_idx" ON "shopping_list_members" USING btree ("user_id");

packages/db/src/migrations/meta/_journal.json

@@ -85,6 +85,27 @@
       "when": 1782896400709,
       "tag": "0011_premium_agent_zero",
       "breakpoints": true
+    },
+    {
+      "idx": 12,
+      "version": "7",
+      "when": 1782977005184,
+      "tag": "0012_sloppy_tigra",
+      "breakpoints": true
+    },
+    {
+      "idx": 13,
+      "version": "7",
+      "when": 1782977520719,
+      "tag": "0013_damp_richard_fisk",
+      "breakpoints": true
+    },
+    {
+      "idx": 14,
+      "version": "7",
+      "when": 1782984288632,
+      "tag": "0014_late_marvex",
+      "breakpoints": true
     }
   ]
 }

packages/db/src/schema/meal-planning.ts

@@ -7,11 +7,13 @@ import {
   date,
   decimal,
   pgEnum,
+  index,
 } from "drizzle-orm/pg-core";
 import { relations } from "drizzle-orm";
 import { users } from "./users";
 import { recipes } from "./recipes";
 import { ingredients } from "./recipes";
+import { collectionMemberRoleEnum } from "./social";
 
 export const mealTypeEnum = pgEnum("meal_type", ["breakfast", "lunch", "dinner", "snack"]);
 export const weekdayEnum = pgEnum("weekday", ["mon", "tue", "wed", "thu", "fri", "sat", "sun"]);
@@ -63,9 +65,32 @@ export const shoppingListItems = pgTable("shopping_list_items", {
   checked: boolean("checked").notNull().default(false),
 });
 
+export const shoppingListMembers = pgTable("shopping_list_members", {
+  id: text("id").primaryKey(),
+  listId: text("list_id").notNull().references(() => shoppingLists.id, { onDelete: "cascade" }),
+  userId: text("user_id").notNull().references(() => users.id, { onDelete: "cascade" }),
+  role: collectionMemberRoleEnum("role").notNull().default("viewer"),
+  createdAt: timestamp("created_at").notNull().defaultNow(),
+}, (t) => [
+  index("shopping_list_members_list_idx").on(t.listId),
+  index("shopping_list_members_user_idx").on(t.userId),
+]);
+
+export const mealPlanMembers = pgTable("meal_plan_members", {
+  id: text("id").primaryKey(),
+  mealPlanId: text("meal_plan_id").notNull().references(() => mealPlans.id, { onDelete: "cascade" }),
+  userId: text("user_id").notNull().references(() => users.id, { onDelete: "cascade" }),
+  role: collectionMemberRoleEnum("role").notNull().default("viewer"),
+  createdAt: timestamp("created_at").notNull().defaultNow(),
+}, (t) => [
+  index("meal_plan_members_plan_idx").on(t.mealPlanId),
+  index("meal_plan_members_user_idx").on(t.userId),
+]);
+
 export const mealPlansRelations = relations(mealPlans, ({ one, many }) => ({
   user: one(users, { fields: [mealPlans.userId], references: [users.id] }),
   entries: many(mealPlanEntries),
+  members: many(mealPlanMembers),
 }));
 
 export const mealPlanEntriesRelations = relations(mealPlanEntries, ({ one }) => ({
@@ -73,11 +98,22 @@ export const mealPlanEntriesRelations = relations(mealPlanEntries, ({ one }) =>
   recipe: one(recipes, { fields: [mealPlanEntries.recipeId], references: [recipes.id] }),
 }));
 
+export const mealPlanMembersRelations = relations(mealPlanMembers, ({ one }) => ({
+  mealPlan: one(mealPlans, { fields: [mealPlanMembers.mealPlanId], references: [mealPlans.id] }),
+  user: one(users, { fields: [mealPlanMembers.userId], references: [users.id] }),
+}));
+
 export const shoppingListsRelations = relations(shoppingLists, ({ one, many }) => ({
   user: one(users, { fields: [shoppingLists.userId], references: [users.id] }),
   items: many(shoppingListItems),
+  members: many(shoppingListMembers),
 }));
 
 export const shoppingListItemsRelations = relations(shoppingListItems, ({ one }) => ({
   list: one(shoppingLists, { fields: [shoppingListItems.listId], references: [shoppingLists.id] }),
 }));
+
+export const shoppingListMembersRelations = relations(shoppingListMembers, ({ one }) => ({
+  list: one(shoppingLists, { fields: [shoppingListMembers.listId], references: [shoppingLists.id] }),
+  user: one(users, { fields: [shoppingListMembers.userId], references: [users.id] }),
+}));