diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
new file mode 100644
index 0000000..1771819
--- /dev/null
+++ b/.github/workflows/validate.yml
@@ -0,0 +1,22 @@
+name: Validate
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+
+      - name: Run repository validation
+        run: python scripts/validate_repo.py
diff --git a/scripts/validate_repo.py b/scripts/validate_repo.py
new file mode 100644
index 0000000..b263a19
--- /dev/null
+++ b/scripts/validate_repo.py
@@ -0,0 +1,42 @@
+from __future__ import annotations
+
+from pathlib import Path
+import compileall
+import sys
+
+ROOT = Path(__file__).resolve().parents[1]
+CONFLICT_TOKENS = ("<<<<<<<", "=======", ">>>>>>>")
+
+
+def check_conflict_markers() -> list[str]:
+    problems: list[str] = []
+    targets = [ROOT / "main.py", *(ROOT / "src").rglob("*.py")]
+    for path in targets:
+        text = path.read_text(encoding="utf-8", errors="ignore")
+        for idx, line in enumerate(text.splitlines(), start=1):
+            if any(token in line for token in CONFLICT_TOKENS):
+                problems.append(f"{path.relative_to(ROOT)}:{idx}: marcador de conflito encontrado")
+            if line.strip().startswith("codex/review-repository-code-"):
+                problems.append(f"{path.relative_to(ROOT)}:{idx}: artefacto de branch encontrado")
+    return problems
+
+
+def main() -> int:
+    marker_errors = check_conflict_markers()
+    if marker_errors:
+        for error in marker_errors:
+            print(error)
+        return 1
+
+    ok = compileall.compile_dir(str(ROOT / "src"), quiet=1)
+    ok_main = compileall.compile_file(str(ROOT / "main.py"), quiet=1)
+    if not ok or not ok_main:
+        print("Falha de compilação Python.")
+        return 1
+
+    print("Validação concluída com sucesso.")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/src/app.py b/src/app.py
index c034dc6..9d2b868 100644
--- a/src/app.py
+++ b/src/app.py
@@ -33,6 +33,7 @@ def _migrate_legacy_config_if_needed():
     if CONFIG_FILE.exists() or not LEGACY_CONFIG_FILE.exists():
         return
 
+ codex/review-repository-code-argiid
     try:
         legacy_data = json.loads(LEGACY_CONFIG_FILE.read_text(encoding="utf-8"))
         APP_CONFIG_DIR.mkdir(parents=True, exist_ok=True)
@@ -44,6 +45,19 @@ def _migrate_legacy_config_if_needed():
 def _read_json_file(path: Path):
     """Le JSON de um ficheiro devolvendo dict vazio em caso de erro."""
     try:
+
+    try:
+        legacy_data = json.loads(LEGACY_CONFIG_FILE.read_text(encoding="utf-8"))
+        APP_CONFIG_DIR.mkdir(parents=True, exist_ok=True)
+        CONFIG_FILE.write_text(json.dumps(legacy_data, indent=2, ensure_ascii=False), encoding="utf-8")
+    except Exception:
+        pass
+
+
+def _read_json_file(path: Path):
+    """Le JSON de um ficheiro devolvendo dict vazio em caso de erro."""
+    try:
+ main
         if path.exists():
             with open(path, "r", encoding="utf-8") as f:
                 return json.load(f)
@@ -122,6 +136,9 @@ def __init__(self):
         self.config = load_config()
         self.scan_paths = []
         self._selection_loaded = False
+ codex/review-repository-code-argiid
+        self.filters_panel_visible = True
+
  codex/review-repository-code-l1cd2s
         self.filters_panel_visible = True
 
@@ -129,6 +146,7 @@ def __init__(self):
         self.filters_panel_visible = True
 
  main
+> main
 
         self.setWindowTitle("Duplicate File Cleaner")
         self.setMinimumSize(900, 620)
@@ -389,6 +407,16 @@ def _build_scan_tab(self):
         self.scan_mode.currentIndexChanged.connect(self._on_mode_change)
         mode_layout.addWidget(self.scan_mode)
         mode_layout.addStretch()
+codex/review-repository-code-argiid
+
+        self.toggle_filters_btn = QPushButton("Esconder Selecao")
+        self.toggle_filters_btn.clicked.connect(self._toggle_filters_panel)
+        mode_layout.addWidget(self.toggle_filters_btn)
+        filter_layout.addLayout(mode_layout)
+
+        self.filters_panel_widget = self._build_filters_panel()
+        filter_layout.addWidget(self.filters_panel_widget, 1)
+
  codex/review-repository-code-l1cd2s
 
         self.toggle_filters_btn = QPushButton("Esconder Selecao")
@@ -450,6 +478,7 @@ def _build_scan_tab(self):
         filter_layout.addLayout(custom_layout)
  main
 
+ main
  main
         scan_splitter.addWidget(filter_group)