feat: add course search UI with ts-rs type bindings

Integrate ts-rs for Rust-to-TypeScript type generation, build course
search page with filters, pagination, and expandable detail rows,
and refactor theme toggle into a reactive store with view transition
animation.

web/src/lib/course.ts

@@ -0,0 +1,61 @@
+import type { DbMeetingTime, CourseResponse, InstructorResponse } from "$lib/api";
+
+/** Convert "0900" to "9:00 AM" */
+export function formatTime(time: string | null): string {
+  if (!time || time.length !== 4) return "TBA";
+  const hours = parseInt(time.slice(0, 2), 10);
+  const minutes = time.slice(2);
+  const period = hours >= 12 ? "PM" : "AM";
+  const display = hours > 12 ? hours - 12 : hours === 0 ? 12 : hours;
+  return `${display}:${minutes} ${period}`;
+}
+
+/** Get day abbreviation string like "MWF" from a meeting time */
+export function formatMeetingDays(mt: DbMeetingTime): string {
+  const days: [boolean, string][] = [
+    [mt.monday, "M"],
+    [mt.tuesday, "T"],
+    [mt.wednesday, "W"],
+    [mt.thursday, "R"],
+    [mt.friday, "F"],
+    [mt.saturday, "S"],
+    [mt.sunday, "U"],
+  ];
+  return days
+    .filter(([active]) => active)
+    .map(([, abbr]) => abbr)
+    .join("");
+}
+
+/** Condensed meeting time: "MWF 9:00 AM–9:50 AM" */
+export function formatMeetingTime(mt: DbMeetingTime): string {
+  const days = formatMeetingDays(mt);
+  if (!days) return "TBA";
+  const begin = formatTime(mt.begin_time);
+  const end = formatTime(mt.end_time);
+  if (begin === "TBA") return `${days} TBA`;
+  return `${days} ${begin}–${end}`;
+}
+
+/** Abbreviate instructor name: "Heaps, John" → "Heaps, J." */
+export function abbreviateInstructor(name: string): string {
+  const commaIdx = name.indexOf(", ");
+  if (commaIdx === -1) return name;
+  const last = name.slice(0, commaIdx);
+  const first = name.slice(commaIdx + 2);
+  return `${last}, ${first.charAt(0)}.`;
+}
+
+/** Get primary instructor from a course, or first instructor */
+export function getPrimaryInstructor(instructors: InstructorResponse[]): InstructorResponse | undefined {
+  return instructors.find((i) => i.isPrimary) ?? instructors[0];
+}
+
+/** Format credit hours display */
+export function formatCreditHours(course: CourseResponse): string {
+  if (course.creditHours != null) return String(course.creditHours);
+  if (course.creditHourLow != null && course.creditHourHigh != null) {
+    return `${course.creditHourLow}–${course.creditHourHigh}`;
+  }
+  return "—";
+}