fix(webapp): regen openapi-ts client + drop lodash import from storybook manager

@hey-api/openapi-ts 0.90→0.97 produces a slightly different sdk/transformers
shape (idiomatic-modules path renames). Regenerated to keep CI's openapi-sync
gate happy.

The Storybook manager imported lodash/startCase, but lodash was never a
declared webapp dep — npm's hoisting masked it; pnpm's strict resolution
exposes it. Replace with a six-line inline implementation; no need to pull
~600 KB of lodash into the manager bundle.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: FelixTJDietrich

webapp/.storybook/manager.ts

@@ -1,7 +1,14 @@
 import { addons } from 'storybook/manager-api';
- 
-import startCase from 'lodash/startCase.js';
- 
+
+const startCase = (input: string): string =>
+  input
+    .replace(/([a-z])([A-Z])/g, '$1 $2')
+    .replace(/[_-]+/g, ' ')
+    .trim()
+    .split(/\s+/)
+    .map((word) => word.charAt(0).toUpperCase() + word.slice(1))
+    .join(' ');
+
 addons.setConfig({
   sidebar: {
     renderLabel: ({ name, type }) => type === 'story' ? name : startCase(name),