Manual save button, file requirement labels, fix config revert bug

- Replace auto-save with manual floating save bar that appears when config
  has unsaved changes (Discard / Save Changes buttons). Fixes race condition
  where server sync overwrote local state after toggling switches.
- Show file requirement name (e.g. "Pitch Deck", "Presentation") above each
  document in the All Uploaded Files section on project detail page
- Pass requirement relation data through to FileViewer component

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

src/app/(admin)/admin/projects/[id]/page.tsx

@@ -677,6 +677,13 @@ function ProjectDetailContent({ projectId }: { projectId: string }) {
                     detectedLang: f.detectedLang,
                     langConfidence: f.langConfidence,
                     analyzedAt: f.analyzedAt ? String(f.analyzedAt) : null,
+                    requirementId: f.requirementId,
+                    requirement: f.requirement ? {
+                      id: f.requirement.id,
+                      name: f.requirement.name,
+                      description: f.requirement.description,
+                      isRequired: f.requirement.isRequired,
+                    } : null,
                   }))}
                 />
               </div>

src/app/(admin)/admin/rounds/[roundId]/page.tsx

@@ -6,7 +6,6 @@ import Link from 'next/link'
 import type { Route } from 'next'
 import { trpc } from '@/lib/trpc/client'
 import { toast } from 'sonner'
-import { useDebouncedCallback } from 'use-debounce'
 import { cn } from '@/lib/utils'
 import { Button } from '@/components/ui/button'
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
@@ -167,7 +166,6 @@ export default function RoundDetailPage() {
 
   const [config, setConfig] = useState<Record<string, unknown>>({})
   const [autosaveStatus, setAutosaveStatus] = useState<'idle' | 'saving' | 'saved' | 'error'>('idle')
-  const pendingSaveRef = useRef(false)
   const [activeTab, setActiveTab] = useState('overview')
   const [previewSheetOpen, setPreviewSheetOpen] = useState(false)
 
@@ -239,28 +237,29 @@ export default function RoundDetailPage() {
     { enabled: round?.roundType === 'FILTERING', refetchInterval: 5_000 },
   )
 
-  // Sync config from server when no pending save
-  if (round && !pendingSaveRef.current) {
+  // Initialize config from server once on load (or when round changes externally)
+  const serverConfig = useMemo(() => (round?.configJson as Record<string, unknown>) ?? {}, [round?.configJson])
+  const configInitialized = useRef(false)
+  if (round && !configInitialized.current) {
     const roundConfig = (round.configJson as Record<string, unknown>) ?? {}
-    if (JSON.stringify(roundConfig) !== JSON.stringify(config)) {
+    if (Object.keys(config).length === 0 || JSON.stringify(roundConfig) !== JSON.stringify(config)) {
       setConfig(roundConfig)
     }
+    configInitialized.current = true
   }
+  const hasUnsavedConfig = useMemo(
+    () => configInitialized.current && JSON.stringify(config) !== JSON.stringify(serverConfig),
+    [config, serverConfig],
+  )
 
   // ── Mutations ──────────────────────────────────────────────────────────
   const updateMutation = trpc.round.update.useMutation({
     onSuccess: () => {
       utils.round.getById.invalidate({ id: roundId })
       setAutosaveStatus('saved')
-      // Keep pendingSaveRef locked briefly so the sync block doesn't
-      // overwrite local config with stale cache before refetch completes
-      setTimeout(() => {
-        pendingSaveRef.current = false
-      }, 500)
       setTimeout(() => setAutosaveStatus('idle'), 2000)
     },
     onError: (err) => {
-      pendingSaveRef.current = false
       setAutosaveStatus('error')
       toast.error(err.message)
     },
@@ -389,17 +388,14 @@ export default function RoundDetailPage() {
 
   const isTransitioning = activateMutation.isPending || closeMutation.isPending || reopenMutation.isPending || archiveMutation.isPending
 
-  const debouncedSave = useDebouncedCallback((newConfig: Record<string, unknown>) => {
-    setAutosaveStatus('saving')
-    updateMutation.mutate({ id: roundId, configJson: newConfig })
-  }, 1500)
-
   const handleConfigChange = useCallback((newConfig: Record<string, unknown>) => {
     setConfig(newConfig)
-    pendingSaveRef.current = true
+  }, [])
+
+  const saveConfig = useCallback(() => {
     setAutosaveStatus('saving')
-    debouncedSave(newConfig)
-  }, [debouncedSave])
+    updateMutation.mutate({ id: roundId, configJson: config })
+  }, [config, roundId, updateMutation])
 
   // ── Computed values ────────────────────────────────────────────────────
   const projectCount = round?._count?.projectRoundStates ?? 0
@@ -603,24 +599,12 @@ export default function RoundDetailPage() {
 
           {/* Action buttons */}
           <div className="flex items-center gap-2 shrink-0 flex-wrap">
-            {autosaveStatus === 'saving' && (
-              <span className="flex items-center gap-1.5 text-xs text-white/70">
-                <Loader2 className="h-3.5 w-3.5 animate-spin" />
-                Saving...
-              </span>
-            )}
             {autosaveStatus === 'saved' && (
               <span className="flex items-center gap-1.5 text-xs text-emerald-300">
                 <CheckCircle2 className="h-3.5 w-3.5" />
                 Saved
               </span>
             )}
-            {autosaveStatus === 'error' && (
-              <span className="flex items-center gap-1.5 text-xs text-red-300">
-                <AlertTriangle className="h-3.5 w-3.5" />
-                Save failed
-              </span>
-            )}
             <Link href={poolLink}>
               <Button variant="outline" size="sm" className="border-white/40 bg-white/15 text-white hover:bg-white/30 hover:text-white">
                 <Layers className="h-4 w-4 mr-1.5" />
@@ -2009,6 +1993,44 @@ export default function RoundDetailPage() {
         </TabsContent>
         )}
       </Tabs>
+
+      {/* Floating save bar — appears when config has unsaved changes */}
+      {hasUnsavedConfig && (
+        <div className="fixed bottom-0 left-0 right-0 z-50 border-t bg-background/95 backdrop-blur supports-[backdrop-filter]:bg-background/80 shadow-[0_-4px_12px_rgba(0,0,0,0.1)]">
+          <div className="container flex items-center justify-between py-3 px-4 max-w-5xl mx-auto">
+            <div className="flex items-center gap-2 text-sm">
+              <div className="h-2 w-2 rounded-full bg-amber-500 animate-pulse" />
+              <span className="text-muted-foreground">You have unsaved changes</span>
+            </div>
+            <div className="flex items-center gap-2">
+              {autosaveStatus === 'error' && (
+                <span className="text-xs text-red-500 mr-2">Save failed — try again</span>
+              )}
+              <Button
+                size="sm"
+                variant="outline"
+                onClick={() => {
+                  setConfig(serverConfig)
+                }}
+              >
+                Discard
+              </Button>
+              <Button
+                size="sm"
+                onClick={saveConfig}
+                disabled={updateMutation.isPending}
+                className="bg-[#de0f1e] hover:bg-[#c00d1a] text-white"
+              >
+                {updateMutation.isPending ? (
+                  <><Loader2 className="h-3.5 w-3.5 mr-1.5 animate-spin" />Saving...</>
+                ) : (
+                  <><Save className="h-3.5 w-3.5 mr-1.5" />Save Changes</>
+                )}
+              </Button>
+            </div>
+          </div>
+        </div>
+      )}
     </div>
   )
 }