Fix TypeScript strict null check errors

Add optional chaining and null checks in build scripts to handle
potentially undefined array elements. Add style prop to Card, Badge,
and Placeholder components, and onClick prop to Text component to
support inline styling in screen components.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/parse-features.ts

@@ -58,7 +58,7 @@ function parseGherkinContent(content: string, filePath: string): ParsedFeature |
   let contentStartIndex = 0;
 
   for (let i = 0; i < lines.length; i++) {
-    const line = lines[i].trim();
+    const line = lines[i]?.trim() ?? '';
     if (line.startsWith('#')) {
       contentStartIndex = i + 1;
       continue;