feat: implement finish dialog with unanswered question detection and submit functionality

css/main.css

@@ -563,6 +563,71 @@ img {
     text-align: center;
 }
 
+/* Finish dialog styling */
+.finish-header {
+    display: flex;
+    justify-content: center;
+    padding-top: 6vh;
+    pointer-events: none;
+}
+.login-risr-box {
+    display: inline-block;
+}
+.login-risr-logo {
+    height: 64px;
+    width: auto;
+    user-drag: none;
+}
+.finish-dialog {
+    display: inline-block;
+    background-color: #1b1b1b;
+    color: #fff;
+    margin: 3vh auto;
+    padding: 1.6rem;
+    border-radius: 8px;
+    max-width: 520px;
+    box-shadow: 0 8px 24px rgba(0,0,0,0.6);
+    text-align: left;
+}
+.logout-title {
+    font-size: 1.4rem;
+    font-weight: 700;
+    margin-bottom: 0.8rem;
+}
+.logout-error.info {
+    background-color: #e3f2fd;
+    color: #0d47a1;
+    border: 1px solid rgba(13,71,161,0.15);
+    padding: 0.8rem;
+    border-radius: 4px;
+    margin-bottom: 0.8rem;
+}
+.logout-text {
+    margin-bottom: 0.8rem;
+    color: #ddd;
+}
+.logout-buttons {
+    display: flex;
+    gap: 0.6rem;
+    justify-content: flex-end;
+}
+.logout-button {
+    padding: 0.6rem 1rem;
+    border-radius: 4px;
+    border: none;
+    cursor: pointer;
+    font-weight: 600;
+}
+.logout-button.danger {
+    background: #b71c1c;
+    color: white;
+}
+.logout-button.primary {
+    background: #1976d2;
+    color: white;
+}
+
+
 .dialog {
     /*display: inline-block;*/
     display: none;