Add initialScrollTime to Schedule day and week views

[czarandy]

A day or week grid in a fill-height Schedule always opened at its first hour. To show the current time when the grid opens, an app had to reach into the grid's markup: query the Schedule time grid element and the schedule-current-time-line test id, then measure the sticky day headers itself. The Bomi EHR calendar needs exactly this.

This adds an initialScrollTime option to createScheduleDayView and createScheduleWeeklyView:

• 'now' places the current time a third of the way down the visible hours, so the hour just before it stays in view. It only scrolls when the grid shows today; on any other week the grid opens at its first hour as before. A time outside the grid's hours scrolls as far as the grid allows.
• {hour, minute?} places that time of day at the top of the visible hours, on any date.
• Leaving the option out keeps the current behavior.

The grid scrolls once, in a layout effect when it mounts, so it never visibly jumps. Later renders keep wherever the user has scrolled, including paging, the current-time line's minute tick, and newly loaded events. Switching between Day and Week mounts a new grid, which applies the option again. The position is measured below the sticky header rows, so a tall all-day row doesn't cover the target. The effect reads the current time from Temporal.Now instead of useCurrentTime, because that hook's server snapshot is still in place during hydration. The option has no effect in height="auto", where the grid doesn't scroll vertically.

Tests are in Chromium browser tests, since jsdom has no layout:

• 'now' lands a third of the way down.
• A grid that doesn't show today stays at the top.
• A time of day lands at the top.
• Paging keeps the user's scroll.

A new FillHeightScrolledToNow story shows the option. pnpm test passes for the unit and Chromium projects (4664 tests). The WebKit project's three hit-area suites couldn't run because WebKit wouldn't install on this machine; they don't touch Schedule. pnpm smoke:package passes.

🤖 Generated with Claude Code

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