fix: tech debt batch 1 — TS errors, vulnerabilities, dead code

- Fixed 12 TypeScript errors across analytics.ts, observer-project-detail.tsx, bulk-upload/page.tsx, settings/profile/page.tsx
- npm audit: 8 vulnerabilities resolved (1 critical, 4 high, 3 moderate)
- Deleted 3 dead files: live-control.ts (618 lines), feature-flags.ts, file-type-categories.ts
- Removed typescript.ignoreBuildErrors: true — TS errors now block builds

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/observer/observer-project-detail.tsx

@@ -933,12 +933,14 @@ export function ObserverProjectDetail({ projectId }: { projectId: string }) {
                 // Group files by round
                 type FileItem = (typeof project.files)[number]
                 const roundMap = new Map<string, { roundId: string | null; roundName: string; sortOrder: number; files: FileItem[] }>()
+                // Build roundId→round lookup from competitionRounds
+                const roundLookup = new Map(competitionRounds.map((r, idx) => [r.id, { name: r.name, sortOrder: idx }]))
                 for (const f of project.files) {
-                  const key = (f as any).roundId ?? '__none__'
+                  const key = f.roundId ?? '__none__'
                   if (!roundMap.has(key)) {
-                    const round = (f as any).round as { id: string; name: string; sortOrder: number } | null
+                    const round = f.roundId ? roundLookup.get(f.roundId) : null
                     roundMap.set(key, {
-                      roundId: round?.id ?? null,
+                      roundId: f.roundId ?? null,
                       roundName: round?.name ?? 'Other Files',
                       sortOrder: round?.sortOrder ?? 999,
                       files: [],