feat: Add linting checks to CI/CD and fix code style issues

.github/copilot-instructions.md

@@ -39,7 +39,7 @@ pnpm build && pnpm preview  # Test production build locally
 ```bash
 pnpm update-indexes      # Fetch latest DI/SELIC/savings rates from BCB API
 ```
-This runs `update-indexes.js`, which calls `https://api.bcb.gov.br/` endpoints and updates `app/assets/indicadores.json`. Critical for production accuracy.
+This runs `update-indexes.mjs`, which calls `https://api.bcb.gov.br/` endpoints and updates `app/assets/indicadores.json`. Critical for production accuracy.
 
 ## Project-Specific Conventions
 
@@ -75,14 +75,24 @@ const periodMultiplier = {
 - Pinia: Store initialized in `index.vue` page via `store.initializeStore()`
 - Tailwind CSS + Vite integration (check `@tailwindcss/vite` in config)
 
+### Linting & Formatting (Nuxt 4/Vue 3 Best Practice)
+- Project uses **ESLint flat config** with official `@nuxt/eslint` module. See `eslint.config.mjs` (auto-generated).
+- Formatting rules are enforced by the **ESLint Stylistic** plugin—no `.editorconfig` file is needed or used.
+- No Prettier: all stylistic and layout concerns handled via ESLint rules.
+- **Lint scripts:**
+  - `pnpm lint` — Check entire codebase for lint and style violations
+  - `pnpm lint:fix` — Auto-fix fixable issues (recommended before commit)
+- **CI/CD:** Lint runs automatically in GitHub Actions (`.github/workflows/ci.yml` and `publish.yml`). Commits/PRs failing lint will cause the pipeline to fail.
+- TypeScript and Vue SFCs are deeply integrated in lint setup. Prefer explicit, non-`any` types.
+
 ## Testing Patterns
 - Unit tests in `test/unit/src/` use **Vitest** with `describe`/`it` blocks
 - Example: `finance.spec.ts` tests IR brackets and compound interest edge cases
 - Test critical financial calculations exhaustively (tax tables, compound formulas)
 
 ## External Dependencies & Integration Points
 - **BCB API** (`https://api.bcb.gov.br/`): Fetches DI, SELIC, savings rates
-  - Series IDs: `4391` (DI), `1 month avg`, others in `update-indexes.js`
+  - Series IDs: `4391` (DI), `1 month avg`, others in `update-indexes.mjs`
 - **Nuxt Schema Org**: SEO metadata (Portuguese pt-BR)
 - **Axios**: HTTP calls for index updates
 - **SonarCloud**: CI/CD quality gates (see badges in README)

.github/workflows/ci.yml

@@ -4,11 +4,14 @@ on:
 jobs:
   deploy:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     steps:
       - name: Checkout 🛎
         uses: actions/checkout@v6
         with:
           fetch-depth: 0
+          show-progress: false
       - uses: pnpm/action-setup@v4
         name: Configure PNPM
       - name: Setup node env 🏗
@@ -19,6 +22,8 @@ jobs:
           cache: 'pnpm'
       - name: Install dependencies 👨🏻‍💻
         run: pnpm install --frozen-lockfile
+      - name: Lint check ✅
+        run: pnpm lint
       - name: Tests 🧑‍🔬
         run: pnpm test
       - name: Deploy 😎

.github/workflows/publish.yml

@@ -4,18 +4,16 @@ on:
     branches:
       - master
   workflow_dispatch:
-# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
-permissions:
-  contents: read
-  pages: write
-  id-token: write
-# Allow one concurrent deployment
 concurrency:
   group: 'pages'
   cancel-in-progress: true
 jobs:
   build:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pages: write
+      id-token: write
     steps:
       - name: Checkout 🛎
         uses: actions/checkout@v6
@@ -32,13 +30,19 @@ jobs:
           cache: 'pnpm'
       - name: Install dependencies 👨🏻‍💻
         run: pnpm install --frozen-lockfile
+      - name: Lint check ✅
+        run: pnpm lint
       - name: Deploy 😎
         run: pnpm generate
       - name: Publish 🍻
         uses: actions/upload-pages-artifact@v4
         with:
           path: ./dist
   deploy:
+    permissions:
+      contents: read
+      pages: write
+      id-token: write
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}

.github/workflows/update-indexes.yml

@@ -2,11 +2,12 @@ name: Update Indexes
 on:
   workflow_dispatch:
   schedule:
-    - cron: '0 8,12,18 * * 1-5'
-      timezone: 'America/Sao_Paulo'
+    - cron: '0 11,15,21 * * 1-5'
 
 jobs:
   update-indicadores:
+    permissions:
+      contents: write
     name: Update indicadores
     runs-on: ubuntu-latest
     steps:

app/components/InvestmentInput.vue

@@ -11,7 +11,9 @@ import PeriodTypeInput from './investment/PeriodTypeInput.vue'
 <template>
   <div class="bg-white rounded-lg shadow-md">
     <div class="px-6 py-4 border-b border-gray-200">
-      <h2 class="text-lg font-semibold text-gray-900">Investimento</h2>
+      <h2 class="text-lg font-semibold text-gray-900">
+        Investimento
+      </h2>
     </div>
     <div class="px-6 py-4">
       <form @submit.prevent>
@@ -37,4 +39,3 @@ import PeriodTypeInput from './investment/PeriodTypeInput.vue'
   gap: 1rem;
 }
 </style>
-