Extract Modal base class and fix target editor defaults

Add core/modal.js with reusable Modal class that handles open/close,
body locking, backdrop close, dirty checking, error display, and a
static stack for ESC key management. Migrate all 13 modals across 8
feature files to use the base class, eliminating ~200 lines of
duplicated boilerplate. Replace manual ESC handler list in app.js
with Modal.closeTopmost(), fixing 3 modals that were previously
unreachable via ESC. Remove 5 unused initialValues variables from
state.js. Fix target editor to auto-select first device/source and
auto-generate name like the KC editor does.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/static/js/features/profiles.js

@@ -5,7 +5,10 @@
 import { _profilesCache, set_profilesCache } from '../core/state.js';
 import { API_BASE, getHeaders, escapeHtml, handle401Error } from '../core/api.js';
 import { t, updateAllText } from '../core/i18n.js';
-import { lockBody, unlockBody, showToast, showConfirm } from '../core/ui.js';
+import { showToast, showConfirm } from '../core/ui.js';
+import { Modal } from '../core/modal.js';
+
+const profileModal = new Modal('profile-editor-modal');
 
 export async function loadProfiles() {
     const container = document.getElementById('profiles-content');
@@ -137,14 +140,12 @@ export async function openProfileEditor(profileId) {
         logicSelect.value = 'or';
     }
 
-    modal.style.display = 'flex';
-    lockBody();
+    profileModal.open();
     updateAllText();
 }
 
 export function closeProfileEditorModal() {
-    document.getElementById('profile-editor-modal').style.display = 'none';
-    unlockBody();
+    profileModal.forceClose();
 }
 
 async function loadProfileTargetChecklist(selectedIds) {
@@ -304,12 +305,10 @@ export async function saveProfileEditor() {
     const nameInput = document.getElementById('profile-editor-name');
     const enabledInput = document.getElementById('profile-editor-enabled');
     const logicSelect = document.getElementById('profile-editor-logic');
-    const errorEl = document.getElementById('profile-editor-error');
 
     const name = nameInput.value.trim();
     if (!name) {
-        errorEl.textContent = 'Name is required';
-        errorEl.style.display = 'block';
+        profileModal.showError('Name is required');
         return;
     }
 
@@ -336,12 +335,11 @@ export async function saveProfileEditor() {
             throw new Error(err.detail || 'Failed to save profile');
         }
 
-        closeProfileEditorModal();
+        profileModal.forceClose();
         showToast(isEdit ? 'Profile updated' : 'Profile created', 'success');
         loadProfiles();
     } catch (e) {
-        errorEl.textContent = e.message;
-        errorEl.style.display = 'block';
+        profileModal.showError(e.message);
     }
 }