feat: add game config panel UI (template, Stimulus controller, CSS)

Config panel with toggle for watched films, hint type checkboxes,
and multi-select for award types above the start game button.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

assets/controllers/game_config_controller.js

@@ -0,0 +1,41 @@
+import { Controller } from '@hotwired/stimulus';
+
+export default class extends Controller {
+    static targets = ['hintType', 'awardSection', 'allAwards', 'awardType'];
+
+    toggleAwardSection() {
+        const awardChecked = this.hintTypeTargets.find(
+            (el) => el.name === 'hint_award'
+        )?.checked;
+
+        this.awardSectionTarget.style.display = awardChecked ? '' : 'none';
+    }
+
+    toggleAllAwards() {
+        const checked = this.allAwardsTarget.checked;
+        this.awardTypeTargets.forEach((el) => {
+            el.checked = checked;
+        });
+    }
+
+    syncAllAwards() {
+        const allChecked = this.awardTypeTargets.every((el) => el.checked);
+        this.allAwardsTarget.checked = allChecked;
+    }
+
+    hintTypeTargetConnected() {
+        this.#bindMinOneChecked();
+    }
+
+    #bindMinOneChecked() {
+        this.hintTypeTargets.forEach((el) => {
+            el.addEventListener('change', () => {
+                const checked = this.hintTypeTargets.filter((e) => e.checked);
+                if (checked.length === 0) {
+                    el.checked = true;
+                }
+                this.toggleAwardSection();
+            });
+        });
+    }
+}

assets/styles/app.css

@@ -732,6 +732,140 @@ body {
     font-size: 16px;
 }
 
+/* ── Game config panel ── */
+
+.config-panel {
+    width: 100%;
+    max-width: 360px;
+    margin-bottom: 24px;
+}
+
+.config-section {
+    padding: 12px 0;
+}
+
+.config-section + .config-section {
+    border-top: 1px solid var(--border);
+}
+
+.config-section-title {
+    font-size: 11px;
+    font-weight: 600;
+    text-transform: uppercase;
+    letter-spacing: 0.05em;
+    color: var(--text-muted);
+    margin-bottom: 10px;
+}
+
+.config-section-subtitle {
+    font-size: 11px;
+    font-weight: 600;
+    color: var(--text-muted);
+    margin: 10px 0 6px;
+}
+
+/* Toggle switch */
+
+.config-toggle {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    cursor: pointer;
+}
+
+.config-toggle-label {
+    font-size: 14px;
+    font-weight: 500;
+    color: var(--text);
+}
+
+.toggle-switch {
+    appearance: none;
+    width: 40px;
+    height: 22px;
+    background: var(--border);
+    border-radius: 100px;
+    position: relative;
+    cursor: pointer;
+    transition: background 0.2s;
+}
+
+.toggle-switch::before {
+    content: '';
+    position: absolute;
+    top: 2px;
+    left: 2px;
+    width: 18px;
+    height: 18px;
+    background: white;
+    border-radius: 50%;
+    transition: transform 0.2s;
+}
+
+.toggle-switch:checked {
+    background: var(--orange);
+}
+
+.toggle-switch:checked::before {
+    transform: translateX(18px);
+}
+
+/* Hint type checkboxes */
+
+.config-hint-types {
+    display: flex;
+    gap: 16px;
+}
+
+.config-checkbox {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    font-size: 13px;
+    color: var(--text);
+    cursor: pointer;
+}
+
+.config-checkbox input[type="checkbox"] {
+    accent-color: var(--orange);
+}
+
+/* Award type list */
+
+.config-award-types {
+    margin-top: 4px;
+}
+
+.config-award-list {
+    border: 1px solid var(--border);
+    border-radius: var(--radius-sm);
+    max-height: 150px;
+    overflow-y: auto;
+    padding: 6px 0;
+}
+
+.config-award-list .config-checkbox {
+    padding: 4px 12px;
+}
+
+.config-award-list .config-checkbox:first-child {
+    padding-bottom: 6px;
+    margin-bottom: 2px;
+    border-bottom: 1px solid var(--border);
+}
+
+/* Flash messages */
+
+.flash-error {
+    margin-top: 16px;
+    padding: 10px 16px;
+    background: #fef2f2;
+    color: #991b1b;
+    border: 1px solid #fecaca;
+    border-radius: var(--radius-sm);
+    font-size: 13px;
+}
+
 .start-loader {
     display: none;
     width: 48px;