supabase / supabase / 29087076456 / 1 – studio-tests

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fix(studio): align PITR calendar dates in the first week (#47806)

## What

Fixes misaligned day cells in the PITR calendar widget for the first
week of the month.

## Why

The PITR calendar draws a \`border\` on each day cell via
\`classNames.day\`. The day \`<td>\` has no explicit width, so
\`box-sizing: border-box\` doesn't apply and the 1px borders add to its
size (36px → 38px), while the weekday header cells stay pinned at
\`w-9\` (36px). Bordered day cells therefore drift right of their
headers, which is most visible in the first partial week where
unbordered leading cells sit flush next to the wider bordered ones.

## How

Pin each day cell to a fixed \`w-9 box-border\` so the border is drawn
inside the 36px box, and let the day button fill the cell (\`w-full\`).
Column pitch now matches the weekday headers regardless of border state.

Class-only change, no logic touched.

Closes FE-3886

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Style**
* Improved calendar day cell sizing and layout for more consistent
rendering.
* Ensured day buttons use full-width styling where applicable, while
preserving existing hover, border, background, and corner behavior.
* **Documentation**
* Added documentation for “Calendar with disabled days,” including a new
interactive preview.
* **New Features**
* Introduced a calendar example demonstrating disabled-day behavior with
mid-week month start and restricted date selection.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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Co-authored-by: Joshen Lim <joshenlimek@gmail.com>
Co-authored-by: Ivan Vasilov <vasilov.ivan@gmail.com>

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