feat: add delete all local data option in settings with keypair destruction

js/components/pages/page-settings.js

@@ -85,6 +85,15 @@ class PageSettings extends HTMLElement {
             }
         })
 
+        // Delete all local data
+        this.querySelector('#clear-all-data')?.addEventListener('click', async () => {
+            if (confirm(t('settings.confirmDeleteAll'))) {
+                await auth.clearAllData()
+                window.location.hash = '#/'
+                window.location.reload()
+            }
+        })
+
         // Toggle UUID visibility
         this.querySelector('#toggle-uid-btn')?.addEventListener('click', () => {
             this.uidVisible = !this.uidVisible
@@ -292,6 +301,16 @@ class PageSettings extends HTMLElement {
                                 ${t('settings.clear')}
                             </button>
                         </div>
+
+                        <div class="setting-item">
+                            <div>
+                                <label>${t('settings.deleteAllData')}</label>
+                                <p class="setting-hint">${t('settings.deleteAllDataHint')}</p>
+                            </div>
+                            <button id="clear-all-data" class="btn btn-outline btn-sm btn-danger">
+                                ${t('settings.deleteAll')}
+                            </button>
+                        </div>
                     </section>
 
                     <!-- About -->

js/services/auth.js

@@ -149,6 +149,30 @@ class AuthService {
         this.notifyListeners()
     }
 
+    /**
+     * Clears all local data (tokens, keys, caches, preferences)
+     */
+    async clearAllData() {
+        await this.logout()
+        cryptoService.destroyKeyPair()
+
+        const keysToRemove = []
+        for (let i = 0; i < localStorage.length; i++) {
+            const key = localStorage.key(i)
+            if (key && key.startsWith('dgray_')) keysToRemove.push(key)
+        }
+        keysToRemove.forEach(k => localStorage.removeItem(k))
+
+        localStorage.removeItem('searchFilters')
+        localStorage.removeItem('locale')
+        localStorage.removeItem('theme')
+
+        for (let i = sessionStorage.length - 1; i >= 0; i--) {
+            const key = sessionStorage.key(i)
+            if (key && key.startsWith('dgray_')) sessionStorage.removeItem(key)
+        }
+    }
+
     /**
      * Reset preferences to defaults on logout
      */

js/services/crypto.js

@@ -140,6 +140,12 @@ class CryptoService {
         this.keyPair = null
     }
 
+    destroyKeyPair() {
+        this.keyPair = null
+        localStorage.removeItem(STORAGE_KEY)
+        localStorage.removeItem(SALT_KEY)
+    }
+
     getPublicKey() {
         if (!this.keyPair) return null
         return this.naclUtil.encodeBase64(this.keyPair.publicKey)