Admin reskin: Vertical alignment of list pagination is off

[TobiasBg]

The vertical alignment of elements in the pagination of WP_List_Tables is off.

The page number input in WP_List_Table pagination was vertically misaligned with the navigation buttons due to different baseline positions.

The fix adds vertical-align: top to .current-page, which aligns the input flush with the buttons without side effects on the bottom pagination row (which has no input field).

Before:

After:

For additional context, other approaches explored and discarded:

• display: flex + align-items: center on the pagination containers fixed alignment but changed horizontal spacing and affected the bottom pagination row.
• vertical-align: middle on buttons and text elements fixed the top row but shifted the bottom pagination which was already aligned.

Trac ticket: https://core.trac.wordpress.org/ticket/64975

## Use of AI Tools

AI assistance: Yes
Tool(s): Claude Code
Model(s): Claude Opus 4.6
Used for: Measuring computed styles in the browser and code reviewing. Final fix validated and reviewed by me.

Ticket: https://core.trac.wordpress.org/ticket/64975

## Summary
This PR addresses the issue where the pagination elements in WP_List_Tables are vertically misaligned. The update ensures consistent alignment across pagination controls for better visual consistency.

## Problem
The pagination UI in WP_List_Tables has inconsistent vertical alignment between page numbers, input field, and navigation buttons. This results in a slightly uneven and unpolished appearance in the admin interface.

## Solution

• Adjusted CSS styles to properly align pagination elements.
• Ensured consistent spacing and alignment pagination controls.

## Screenshot

Trac ticket: https://core.trac.wordpress.org/ticket/64975

Fixes the vertical alignment issue in WP_List_Table pagination rows.
Changed .tablenav-pages margin from 0 0 9px to 0 and added
display: flex + align-items: center for proper alignment.

[SergeyBiryukov]

In 62182:

Admin Reskin: Correct vertical alignment of pagination elements in list tables.

Props TobiasBg, rcorrales, opurockey, rahultank, SergeyBiryukov.
Fixes #64975.

[SergeyBiryukov]

Reopening for 7.0 consideration.

[audrasjb]

Here is a second committer sign off 👍

[SergeyBiryukov]

In 62197:

Admin Reskin: Correct vertical alignment of pagination elements in list tables.

Follow-up to [61645].

Reviewed by audrasjb, SergeyBiryukov.
Merges [62182] to the 7.0 branch.

Props TobiasBg, rcorrales, opurockey, rahultank, SergeyBiryukov.
Fixes #64975.