[Bug]: DatePicker popover is not aligned with the input

[asphum]

Component

date-picker

Describe the bug

The DatePicker calendar popover does not stay anchored to the input.

Expected: popover opens directly under the field (side="bottom", align="start").

Actual: the calendar floats to the right of the input (often over the neighboring column), so it looks disconnected from the field.

Reproduced on the docs page as well as in-app. portal defaults to true.

Screenshot: (attach the image)

Reproduction

Steps

1. Open https://sv5ui.vercel.app/docs/components/date-picker
2. In Multiple Months (or any DatePicker demo), click the date field / calendar icon
3. Compare the popover position with the input

Minimal repro

<script lang="ts">
  import { DatePicker } from "sv5ui";
</script>

<div class="grid grid-cols-2 gap-8 p-8">
  <DatePicker />
  <p>Neighbor column</p>
</div>

Expected
Calendar popover is flush under the input (same left edge).

Actual
Popover is offset to the right, not aligned with the input.

<img width="786" height="372" alt="Image" src="https://github.com/user-attachments/assets/0896c5ab-0b57-4f85-a5b4-dbd6bf2e70f1" />

### sv5ui version

2.7.0

### Area

Not sure

### Checklist

- [x] I searched existing issues and this is not a duplicate.
- [x] I reproduced this on the latest version of sv5ui.

[ndlabdev]

Thanks for the report and the clear steps. Confirmed, including on the docs page.

Cause

The calendar popover was anchored to the calendar icon button instead of the date field. That button sits at the end of the field, so with align="start" the popover lined up with the icon's left edge: several hundred pixels right of the field, and over the neighbouring column in a two-column layout. DateRangePicker had the same problem.

Fix

Both components now anchor the popover to the whole field, so the calendar opens directly under the field's left edge, the same way Select places its list. align="center" now centres on the field and align="end" is unchanged. Near the right edge of the viewport the popover still shifts left to stay on screen.

The fix is in #221 and will be part of the next release. If the popover is still misplaced after upgrading, please share a runnable reproduction and I will take another look.