Fix mobile overflow, logo nav, round activation, compare projects setting

- Fix assignments page header overflow on mobile (flex-wrap)
- Hide 'Back to Dashboard' button on mobile (logo tap navigates home)
- Make logo/brand text clickable to navigate to role dashboard
- Snap windowOpenAt to now when manually activating a round early
- Gate Compare Projects cards behind jury_compare_enabled setting (defaults off)
- Expose jury_compare_enabled in getFeatureFlags tRPC procedure

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

src/server/services/round-engine.ts

@@ -106,10 +106,21 @@ export async function activateRound(
       }
     }
 
+    // If activating before the scheduled start, snap windowOpenAt to now
+    const now = new Date()
+    const windowData: Record<string, Date> = {}
+    if (round.windowOpenAt && new Date(round.windowOpenAt) > now) {
+      windowData.windowOpenAt = now
+    }
+    // If no windowOpenAt was set at all, also set it to now
+    if (!round.windowOpenAt) {
+      windowData.windowOpenAt = now
+    }
+
     const updated = await prisma.$transaction(async (tx: any) => {
       const result = await tx.round.update({
         where: { id: roundId },
-        data: { status: 'ROUND_ACTIVE' },
+        data: { status: 'ROUND_ACTIVE', ...windowData },
       })
 
       await tx.decisionAuditLog.create({