Update displayDate to use local time format preferences

[mzhang28]

I noticed that the time formats are hardcoded:

In my local timezone, this should be displayed as 11/30 6:16 PM.

I've rewritten it to just use the date/time options provided by Intl.DateTimeFormatOptions, so it will respect the locale time display format.

Let me know if there is a design for this that works better!

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Important

Update displayDate in utils.ts to use locale-specific formatting, affecting date display in +page.svelte.

• Behavior:
  • Update displayDate() in utils.ts to use Intl.DateTimeFormatOptions for locale-specific date and time formatting.
  • Adjusts displayDate() to handle invalid dates using Number.isNaN().
• UI:
  • Modify +page.svelte to use updated displayDate() for displaying edited_at with locale-specific formatting.
• Misc:
  • Minor code style adjustments in utils.ts and +page.svelte for consistency.

^{This description was created by for bf8ef49. It will automatically update as commits are pushed.}

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[ellipsis-dev]

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[mzhang28]

I have read the CLA Document and I hereby sign the CLA

[rubenfiszel]

Thanks for the PR, we will review shortly