feat: add dynamic button state updates for hidden files config with modified vault count display and visual highlights to indicate unsaved changes

frontend/app.js

@@ -3234,6 +3234,29 @@
   // Track which vaults have been modified
   let modifiedVaults = new Set();
   
+  function updateHiddenFilesButtonStates() {
+    const saveBtn = document.getElementById("cfg-save-hidden-files");
+    const reindexBtn = document.getElementById("cfg-reindex-hidden");
+    
+    if (modifiedVaults.size > 0) {
+      if (saveBtn) {
+        saveBtn.textContent = `💾 Sauvegarder (${modifiedVaults.size} modifié${modifiedVaults.size > 1 ? 's' : ''})`;
+        saveBtn.classList.add("config-btn-highlight");
+      }
+      if (reindexBtn) {
+        reindexBtn.textContent = "🔄 Sauvegarder et réindexer";
+      }
+    } else {
+      if (saveBtn) {
+        saveBtn.textContent = "💾 Sauvegarder";
+        saveBtn.classList.remove("config-btn-highlight");
+      }
+      if (reindexBtn) {
+        reindexBtn.textContent = "🔄 Réindexer";
+      }
+    }
+  }
+  
   async function loadHiddenFilesSettings() {
     const container = document.getElementById("hidden-files-vault-list");
     if (!container) return;
@@ -3338,15 +3361,18 @@
       addBtn.addEventListener("click", () => {
         addWhitelistItem(vault.name);
         modifiedVaults.add(vault.name);
+        updateHiddenFilesButtonStates();
       });
       input.addEventListener("keypress", (e) => {
         if (e.key === "Enter") {
           addWhitelistItem(vault.name);
           modifiedVaults.add(vault.name);
+          updateHiddenFilesButtonStates();
         }
       });
       checkbox.addEventListener("change", () => {
         modifiedVaults.add(vault.name);
+        updateHiddenFilesButtonStates();
       });
     });
   }
@@ -3367,6 +3393,7 @@
     removeBtn.addEventListener("click", () => {
       item.remove();
       modifiedVaults.add(vaultName);
+      updateHiddenFilesButtonStates();
     });
     
     return item;
@@ -3435,6 +3462,7 @@
       
       await Promise.all(promises);
       modifiedVaults.clear();
+      updateHiddenFilesButtonStates();
       showToast("✓ Paramètres sauvegardés", "success");
     } catch (err) {
       console.error("Failed to save hidden files settings:", err);
@@ -3467,6 +3495,8 @@
         showToast("✓ Réindexation terminée", "success");
       }
       
+      modifiedVaults.clear();
+      updateHiddenFilesButtonStates();
       loadDiagnostics();
       await Promise.all([loadVaults(), loadTags()]);
     } catch (err) {