Migrate frontend to TypeScript with Deno-based tooling (#206)

Compiles assets/*.ts via sensiolabs/typescript-bundle (standalone SWC
binary) and adds Deno for formatting, linting, type-checking, and
tests, keeping the project's no-Node/npm approach intact. Wires all
four into CI, the Justfile, and the pre-commit hook.

assets/controllers/bo/quiz_controller.ts

@@ -0,0 +1,35 @@
+import { Controller } from '@hotwired/stimulus';
+import { Modal, Tooltip } from 'bootstrap';
+
+export default class extends Controller {
+    static targets = ['clearModal', 'deleteModal'];
+
+    declare readonly clearModalTarget: HTMLElement;
+    declare readonly deleteModalTarget: HTMLElement;
+
+    tooltips: Tooltip[] = [];
+
+    connect(): void {
+        this.tooltips = [];
+        const tooltipTriggerList = this.element.querySelectorAll(
+            '[data-bs-toggle="tooltip"]',
+        );
+        [...tooltipTriggerList].forEach((tooltipTriggerEl) => {
+            this.tooltips.push(Tooltip.getOrCreateInstance(tooltipTriggerEl));
+        });
+    }
+
+    disconnect(): void {
+        this.tooltips.forEach((tooltip) => tooltip.dispose());
+    }
+
+    clearQuiz(): void {
+        const modal = Modal.getOrCreateInstance(this.clearModalTarget);
+        modal.show();
+    }
+
+    deleteQuiz(): void {
+        const modal = Modal.getOrCreateInstance(this.deleteModalTarget);
+        modal.show();
+    }
+}