Timeseries panel update

[kwongz]

Description

Checklist

• For UI or styling changes, I have added a screenshot or gif showing before & after
• I have added a changeset
• I have added to the docs where applicable
• I have added to the VS Code extension where applicable

[kwongz]

@mcrascal

• Fixed responsiveness for smaller screens
• added Theme styling for darkmode

Lightmode:

Dark Mode:

Improvements:

• I think we can look for a different text-color for the selected metric and the dates, currently using base-content-muted
• Some of the font colors have changed, such as the bg for the positive and neg nums since we were using green and red 400 and 200, but I could only find the one positive and negative color. So the background red and green are a bit different then the original
  
  -Not too familiar with bg-[radial-gradient(#f9fafb_1px,transparent_1px)] and adding out base vars instead of a hex code (#f9fafb), so I still need to fix the radial gradient in dark mode.