refactor: extract shared utilities and standardize page patterns

- Add fmtBytes() and csvToArr() helpers to hoover/helpers.js
- Replace inline async patterns with ActionButton/ConfirmDelete in wireguard.js
- Convert addDomain/editDomain to QuickModal + apiSubmit in proxy.js
- Convert settingsModal handlers to formAction in certs.js
- Remove redundant synced handling from dhcp.js apply button
- Add onComplete callback to ConfirmDelete (fixes users.js onRefresh bug)
- Fix passkeys.js ActionCell/Table usage (invalid component API)
- Remove duplicate fmtBytes from dashboard.js

webui/static/hoover/components/data.js

@@ -82,6 +82,7 @@ export function Card(props = {}) {
  * @param {string} [props.label]   - Button text (default: 'Remove')
  * @param {object} [props.body]    - Optional JSON body to send with DELETE
  * @param {string} [props.deleteKey] - Unique ID for pending-delete row styling
+ * @param {function} [props.onComplete] - Callback after successful deletion
  */
 export function ConfirmDelete(props = {}) {
     const opts = { method: 'DELETE' };
@@ -118,13 +119,16 @@ export function ConfirmDelete(props = {}) {
                         if (props.deleteKey && promises.length) {
                             Promise.all(promises).finally(() => {
                                 _deleting.delete(props.deleteKey);
+                                if (props.onComplete) props.onComplete();
                             });
                         }
                     } else if (props.deleteKey) {
-                        // Cleanup dimming synchronously on DELETE completion rather than
-                        // relying on a heuristic timeout that breaks when tabs are throttled.
                         _deleting.delete(props.deleteKey);
                     }
+
+                    if (props.onComplete && !props.refresh) {
+                        props.onComplete();
+                    }
                 } else {
                     toast(r.error || 'Failed', 'error');
                 }