feat(frontend): replace native confirms and enhance form controls

Add ConfirmDialog to replace window.confirm for delete actions
Enhance SwitchGroup with grid layout, descriptions, and disabled state
Update AdminView to use TagsSelect and SwitchGroup for better UX

frontend/src/styles/main.css

@@ -1318,6 +1318,11 @@ svg {
   --btn-fg: #ffffff;
 }
 
+.link-button--danger {
+  --btn-bg: var(--danger);
+  --btn-fg: #ffffff;
+}
+
 .ui-button--ghost,
 .plain-button,
 .row-actions button,
@@ -2762,6 +2767,14 @@ button:disabled,
   font-weight: 850;
 }
 
+.confirm-dialog__message {
+  margin: 0;
+  color: var(--ink-soft);
+  font-size: 15px;
+  font-weight: 750;
+  line-height: 1.5;
+}
+
 .checklist-list {
   display: grid;
   gap: 10px;
@@ -7534,6 +7547,12 @@ button:disabled,
   align-items: center;
 }
 
+.switch-group__options--grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
+  align-items: stretch;
+}
+
 .switch-control {
   position: relative;
   display: inline-flex;
@@ -7553,7 +7572,29 @@ button:disabled,
   gap: 6px;
 }
 
+.switch-group__options--grid .switch-control--stacked {
+  min-height: 52px;
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto;
+  justify-items: stretch;
+  gap: 10px;
+  padding: 10px;
+  border: 1px solid var(--line);
+  border-radius: var(--radius-control);
+  background: var(--surface);
+}
+
+.switch-control--disabled {
+  cursor: not-allowed;
+  opacity: 0.58;
+}
+
+.switch-control__copy {
+  min-width: 0;
+}
+
 .switch-control__label {
+  display: block;
   color: var(--ink-soft);
   font-size: 13px;
   line-height: 1.2;
@@ -7561,6 +7602,21 @@ button:disabled,
   overflow-wrap: anywhere;
 }
 
+.switch-control__description {
+  display: block;
+  margin-top: 2px;
+  color: var(--muted);
+  font-size: 12px;
+  font-weight: 650;
+  line-height: 1.3;
+  overflow-wrap: anywhere;
+}
+
+.switch-group__options--grid .switch-control__label,
+.switch-group__options--grid .switch-control__description {
+  text-align: left;
+}
+
 .switch-control input {
   position: absolute;
   inline-size: 1px;