feat: support swipe to switch week

[Kaltsit-cell]

No description provided.

[Copilot]

Pull request overview

This PR introduces horizontal paging to the schedule screen so users can swipe between weeks, and wires the week selector to control the pager.

Changes:

• Added HorizontalPager/rememberPagerState to enable week-to-week swiping.
• Updated week selector taps and “locate current week” action to scroll the pager.
• Added effects to synchronize pager scrolling with the week selector list position.

Comments suppressed due to low confidence (1)

app/src/main/java/com/ahu/ahutong/ui/screen/main/Schedule.kt:257

• Inside HorizontalPager { … }, the page index parameter isn’t used; all pages render based on the single global currentWeek. This means every page’s content is identical and changes globally when currentWeek changes, which defeats paging and can produce confusing swipe behavior (especially with prefetch/offscreen pages). Derive a weekForPage = page + 1 and use that for weekDates, course filtering, and highlighting, instead of currentWeek inside the pager content.

        HorizontalPager(
            state = pagerState,
            modifier = Modifier.fillMaxWidth()
        ) {
        Box(
            modifier = with(CourseCardSpec) {
                Modifier
                    .fillMaxWidth()
                    .height(mainRowHeight + (cellHeight + cellSpacing) * 13 + 24.dp)
                    .clip(SmoothRoundedCornerShape(32.dp))
                    .background(99.n1 withNight 20.n1)
                    .padding(top = 8.dp)
                    .padding(cellSpacing)
            }
        ) {
            // TODO: current time indicator
            // weekday tags

            val weekDates by remember(currentWeek, scheduleConfig?.startTime) {
                mutableStateOf(
                    List(7) { index ->
                        Calendar.getInstance().apply {
                            time = scheduleConfig?.startTime
                                ?: SimpleDateFormat("MM-dd", Locale.CHINA).parse("09-01")
                            add(Calendar.DATE, ((currentWeek - 1) * 7) + index)
                        }
                    }
                )
            }

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