fix(web): Update asset grid date group titles to show full date

[Snowknight26]

Description

Show the full date for asset grid date groups when hovering over the element.

How Has This Been Tested?

• Hovered over the date group elements to show the full dates when the dates are relative and absolute

Screenshots (if appropriate)

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if applicable
• I have no unrelated changes in the PR.
• I have confirmed that any new dependencies are strictly necessary.
• I have written tests for new code (if applicable)
• I have followed naming conventions/patterns in the surrounding code
• All code in src/services uses repositories implementations for database calls, filesystem operations, etc.
• All code in src/repositories/ is pretty basic/simple and does not have any immich specific logic (that belongs in src/services)

[github-actions]

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