chore: remover código morto e artefatos, adicionar CI e script typecheck

- componentes sem nenhuma importação (card, items, DeleteButton, IdInput,
  NutriScoreBadge, NutritionBar, NutritionChart, PageTitle, PersuasiveCTA,
  landing/SearchBar), imports e variável não usados (avisos do lint)
- sw.js na raiz: não é referenciado e carrega script de terceiros
  (fenoofaussut.net)
- bun.lock (o deploy e o README usam pnpm), graphify-out/ e os bancos
  SQLite versionados em prisma/prisma (pnpm db:push recria o banco)
- devDependency depcheck sem uso
- .gitignore: *.sqlite, *.sqlite-journal, graphify-out/
- script typecheck e workflow do GitHub Actions (lint, typecheck, test, build)

app/components/FilterSidebar.tsx

@@ -16,7 +16,6 @@ import {
   BarChart3,
 } from "lucide-react";
 import * as LucideIcons from "lucide-react";
-import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { Checkbox } from "@/components/ui/checkbox";
 import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group";
@@ -29,7 +28,6 @@ import {
   AccordionTrigger,
 } from "@/components/ui/accordion";
 import { Badge } from "@/components/ui/badge";
-import { Separator } from "@/components/ui/separator";
 import { SortDropdown } from "@/app/components/SortDropdown";
 import { FilterBadges } from "@/app/components/FilterBadge";
 import {