fix: convert Map to Record for server-client boundary, remove dead currentUser prop

- WeatherBoard: change previousEntries type from Map<string, PreviousEntry> to Record<string, PreviousEntry> and update lookup from .get() to bracket notation
- page.tsx: wrap previousEntries with Object.fromEntries() before passing as prop, remove unused currentUser prop
- WeatherCard: remove spurious eslint-disable-next-line comment for non-existent rule react-hooks/set-state-in-effect

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

src/components/weather/WeatherBoard.tsx

@@ -38,11 +38,6 @@ type PreviousEntry = {
 interface WeatherBoardProps {
   sessionId: string;
   currentUserId: string;
-  currentUser: {
-    id: string;
-    name: string | null;
-    email: string;
-  };
   entries: WeatherEntry[];
   shares: Share[];
   owner: {
@@ -51,7 +46,7 @@ interface WeatherBoardProps {
     email: string;
   };
   canEdit: boolean;
-  previousEntries: Map<string, PreviousEntry>;
+  previousEntries: Record<string, PreviousEntry>;
 }
 
 export function WeatherBoard({
@@ -146,7 +141,7 @@ export function WeatherBoard({
               currentUserId={currentUserId}
               entry={entry}
               canEdit={canEdit}
-              previousEntry={previousEntries.get(entry.userId) ?? null}
+              previousEntry={previousEntries[entry.userId] ?? null}
             />
           ))}
         </tbody>

src/components/weather/WeatherCard.tsx

@@ -69,7 +69,6 @@ export function WeatherCard({ sessionId, currentUserId, entry, canEdit, previous
 
   // Sync local state with props when they change (e.g., from SSE refresh)
   useEffect(() => {
-    // eslint-disable-next-line react-hooks/set-state-in-effect
     setNotes(entry.notes || '');
     setPerformanceEmoji(entry.performanceEmoji || null);
     setMoralEmoji(entry.moralEmoji || null);