Fail submission in the UI if an error occurs (#50)

## Motivation

Currently submissions seem to succeed if submission fails, but actually
silently don't go through.

## Proposal

Display an error in the UI if an error occurs in the code during
submission.

## Test Plan

Manually tested (by injecting an error into
`LineraService.submitSolution`).

Co-authored-by: Tudor Eșan <[email protected]>

Author: Twey

frontend/src/lib/game-of-life/hooks/usePuzzleGame.ts

@@ -155,13 +155,17 @@ export function usePuzzleGame() {
         throw new Error(validationResult.errorMessage || "Solution is not valid");
       }
 
-      return lineraService.submitSolution(currentPuzzle.id, board);
+      const result = await lineraService.submitSolution(currentPuzzle.id, board);
+
+      if (!result) {
+        setValidationResult({ isValid: false, message: "Incorrect solution, try again" });
+      } else {
+        setValidationResult({ isValid: true, message: "Solution submitted successfully!" });
+      }
+
+      return result;
     },
     onSuccess: () => {
-      setValidationResult({
-        isValid: true,
-        message: "Solution submitted successfully!",
-      });
       // Invalidate queries to refresh completion status from blockchain
       queryClient.invalidateQueries({ queryKey: ["completedPuzzles"] });
       queryClient.invalidateQueries({
@@ -222,7 +226,7 @@ export function usePuzzleGame() {
   const loadNextPuzzle = useCallback(() => {
     if (!currentPuzzleId) return false;
 
-    const currentIndex = KNOWN_PUZZLES.findIndex(p => p.id === currentPuzzleId);
+    const currentIndex = KNOWN_PUZZLES.findIndex((p) => p.id === currentPuzzleId);
     if (currentIndex === -1) return false;
 
     // Get next puzzle (cycle to beginning if at end)
@@ -239,7 +243,7 @@ export function usePuzzleGame() {
   const loadPreviousPuzzle = useCallback(() => {
     if (!currentPuzzleId) return false;
 
-    const currentIndex = KNOWN_PUZZLES.findIndex(p => p.id === currentPuzzleId);
+    const currentIndex = KNOWN_PUZZLES.findIndex((p) => p.id === currentPuzzleId);
     if (currentIndex === -1) return false;
 
     // Get previous puzzle (cycle to end if at beginning)