feat: JKKP 6/7 PDF generation via pdf-lib, download from incident detail

Also excludes node_modules.nosync from vitest test discovery to fix pre-existing bleed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FFDuBhMKvoWjrWT3ZnGmmr

vitest.config.ts

@@ -9,6 +9,7 @@ export default defineConfig({
     environment: 'jsdom',
     globals: true,
     setupFiles: [],
+    exclude: ['node_modules/**', 'node_modules.nosync/**', '.next/**'],
   },
   resolve: {
     alias: {