Regexp log search, results date interval and count

[DavidePrincipi]

The System logs page Search matches by a simple substring. 🤔 When the Search completes, it's not clear if the Max lines limit was reached or not, and what is the time interval the returned lines cover.

1. 🎯 Enable search by regular-expression
2. 🎯 Show the number of retrieved log lines and their date-time interval

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[AmaLuci]

This update improves the search experience and overall usability of the logs page. Mockups in Figma here

Changes include:

• improved alignment and sizing of existing input fields

• optional regular expression search with dedicated toggle

• new search feedback showing matching lines count and displayed date range

• new quick layout actions in the top-right corner:

  • collapse/expand filters
  • switch between horizontal and vertical layouts

The vertical layout becomes available only when comparing multiple searches, while horizontal layout remains the default.

[andre8244]

LGTM