feat: mobile edit-as-default with sticky save/delete actions

- Update MobileEditView to render Save and optional Delete in a
  sticky bottom action bar; header now shows Cancel + title only.
- Make ConfigProfilesMobileView open edit view on profile tap.
- Make ToolWorkshopMobileView open edit view on tool type tap.
- Wire delete into MobileEditView for existing profiles and tool
  types.
- Stay on edit view after saving an existing item; create flow
  returns to list as before.
- Update ToolWorkshopPage cancel to return to list.
- Add mobile-edit-actions and mobile-edit-delete CSS.

Quality gates: npm run typecheck, npm run lint, npm test -- --run (87 passed)

Refs: openspec/changes/mobile-edit-default-bottom-actions

apps/web/src/components/features/mobile/mobile-edit-view.tsx

@@ -16,6 +16,8 @@ interface MobileEditViewProps {
   fields?: FormField[];
   onSave: (data: Record<string, string | number | boolean>) => void;
   onCancel: () => void;
+  onDelete?: () => void;
+  deleteLabel?: string;
   isSaving?: boolean;
   children?: React.ReactNode;
 }
@@ -25,6 +27,8 @@ export const MobileEditView: React.FC<MobileEditViewProps> = ({
   fields,
   onSave,
   onCancel,
+  onDelete,
+  deleteLabel = "Delete",
   isSaving = false,
   children,
 }) => {
@@ -59,14 +63,7 @@ export const MobileEditView: React.FC<MobileEditViewProps> = ({
           Cancel
         </button>
         <h1 className="mobile-edit-title">{title}</h1>
-        <button
-          className="mobile-edit-save"
-          onClick={() => onSave(formData)}
-          type="button"
-          disabled={isSaving}
-        >
-          {isSaving ? "Saving..." : "Save"}
-        </button>
+        <div style={{ width: "4rem" }} />
       </header>
 
       <form className="mobile-edit-form" onSubmit={handleSubmit}>
@@ -156,6 +153,27 @@ export const MobileEditView: React.FC<MobileEditViewProps> = ({
           </div>
         ))}
       </form>
+
+      <div className="mobile-edit-actions">
+        <button
+          className="mobile-edit-save"
+          onClick={() => onSave(formData)}
+          type="button"
+          disabled={isSaving}
+        >
+          {isSaving ? "Saving..." : "Save"}
+        </button>
+        {onDelete && (
+          <button
+            className="mobile-edit-delete"
+            onClick={onDelete}
+            type="button"
+            disabled={isSaving}
+          >
+            {deleteLabel}
+          </button>
+        )}
+      </div>
     </div>
   );
 };