Use tabular nums to prevent layout jitter when changing the date

[kuba-orlik]

What kind of change does this PR introduce?

A small layout annoyance — look how layout "jumps" when you change the date — it's because we're using a font variant where each digit has slightly different width

Screencast.From.2025-10-21.21-39-41.mp4

Why was this change needed?

To fix the distracting layout shift while changing the date/time of the scheduled post

Other information:

Not much to add

Checklist:

Put a "X" in the boxes below to indicate you have followed the checklist;

• I have read the CONTRIBUTING guide.
• I checked that there were not similar issues or PRs already open for this.
• This PR fixes just ONE issue (do not include multiple issues or types of change in the same PR) For example, don't try and fix a UI issue and include new dependencies in the same PR.

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