Move UI to BoardUI with slate + salmon theme; add PDF plan export

- Adopt BoardUI (Pro init): theme tokens, Inter, .dark mode, Button,
  SegmentedControl, Meter, Skeleton and ThemeToggle; remap the app's
  color aliases onto BoardUI tokens and swap lucide for Remix icons
- Retint BoardUI's neutral ramp to cool slate with a salmon accent;
  drop the dotted background; raise muted text contrast
- Simplify the landing page and remove the overlap explorer
- Planner: explicit "I have this" toggle on grocery lines, pantry panel
  above the menu with the staples list spelled out, sticky aisle
  header fix, and a "Download PDF" plan export (jsPDF, lazy-loaded)
- Recipes: replace the family cabbage soup with Cade's Cabbage Soup
  (adds Bone-In Ham Steak to the catalog); remove Ham, Bean & Cabbage Soup
- Remove unused BoardUI components, dependencies and exports

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/lib/recipes/dish.ts

@@ -14,7 +14,7 @@ import type { Appliance, CookingStyle, Cuisine, MealKind, RecipeData, RecipeIngr
 // module load, so typos fail loudly in dev instead of producing $0 groceries.
 // ---------------------------------------------------------------------------
 
-export interface DishInput {
+interface DishInput {
   title: string;
   /** Defaults to a slug of the title. Set it explicitly to keep saved plans stable if you rename. */
   id?: string;
@@ -35,7 +35,7 @@ export interface DishInput {
 
 const UNITS = new Set<RecipeUnit>(["g", "oz", "lb", "ml", "tsp", "tbsp", "cup", "each"]);
 
-export const slugify = (text: string) =>
+const slugify = (text: string) =>
   text
     .normalize("NFD") // "Étouffée" → "Etouffee" + combining accents…
     .replace(/[\u0300-\u036f]/g, "") // …which this strips