diff --git a/public/app.js b/public/app.js
index 77ac27c..81a68ee 100644
--- a/public/app.js
+++ b/public/app.js
@@ -2387,16 +2387,16 @@ const initApp = () => {
   if (obsSearchCrianca) obsSearchCrianca.addEventListener('input', renderObsList);
 
   // Preenche select de meses
-  const populateMonthFilter = () => {
+  function populateMonthFilter() {
     if (!obsFilterMes) return;
     const months = [...new Set(allObservations.map(o => o.date?.slice(0, 7)))]
       .filter(Boolean).sort().reverse();
     obsFilterMes.innerHTML = '<option value="">Todos os meses</option>' +
       months.map(m => `<option value="${m}">${m.split('-')[1]}/${m.split('-')[0]}</option>`).join('');
-  };
+  }
 
   // Renderiza lista filtrada
-  const renderObsList = () => {
+  function renderObsList() {
     if (!obsList) return;
     const mes = obsFilterMes?.value || '';
     const tag = obsFilterTag?.value || '';
diff --git a/scratch/debug_app.js b/scratch/debug_app.js
new file mode 100644
index 0000000..43fd797
--- /dev/null
+++ b/scratch/debug_app.js
@@ -0,0 +1,97 @@
+const fs = require('fs');
+const path = require('path');
+
+const html = fs.readFileSync(path.join(__dirname, '../public/index.html'), 'utf8');
+
+// Mock HTML elements from index.html
+const elements = {};
+const matchIds = html.match(/id="([^"]+)"/g) || [];
+matchIds.forEach(idAttr => {
+  const id = idAttr.split('"')[1];
+  elements[id] = {
+    id,
+    addEventListener: (event, cb) => {},
+    style: {},
+    classList: {
+      add: () => {},
+      remove: () => {},
+      contains: () => false
+    },
+    querySelectorAll: () => []
+  };
+});
+
+global.document = {
+  readyState: 'complete',
+  documentElement: {
+    setAttribute: (name, val) => {},
+    getAttribute: (name) => 'dark'
+  },
+  getElementById: (id) => {
+    if (!elements[id]) {
+      console.warn(`[Warning] getElementById: ID "${id}" not found in index.html!`);
+      return null;
+    }
+    return elements[id];
+  },
+  querySelector: (selector) => {
+    return {
+      addEventListener: () => {},
+      style: {},
+      classList: { add: () => {}, remove: () => {} }
+    };
+  },
+  querySelectorAll: (selector) => {
+    return [];
+  },
+  createElement: (tag) => {
+    return { style: {}, classList: { add: () => {} } };
+  },
+  body: {
+    appendChild: () => {}
+  },
+  addEventListener: (event, cb) => {
+    if (event === 'DOMContentLoaded') {
+      cb();
+    }
+  }
+};
+
+global.window = {
+  location: { href: '' },
+  speechSynthesis: {
+    getVoices: () => [],
+    addEventListener: () => {}
+  },
+  document: global.document
+};
+
+global.localStorage = {
+  getItem: () => null,
+  setItem: () => {},
+  removeItem: () => {}
+};
+
+global.marked = {
+  Renderer: function() {},
+  use: () => {}
+};
+
+global.navigator = {
+  clipboard: {}
+};
+
+// Mock fetch to not crash Node
+global.fetch = () => new Promise((resolve) => resolve({
+  ok: true,
+  json: () => Promise.resolve({ success: true, observations: [] }),
+  text: () => Promise.resolve('')
+}));
+
+try {
+  console.log("Loading public/app.js with proper mock...");
+  require('../public/app.js');
+  console.log("Successfully ran public/app.js without throwing errors!");
+} catch (err) {
+  console.error("FATAL ERROR running app.js:", err);
+}