style: improve terminal split view border style

[erha19]

Types

• 💄 Style Changes

Background or solution

🤖 Generated by Copilot at bb67b16

• Changed the background color of the terminal resize handle to match the terminal border color (link)
• Removed an empty change from terminal.color.ts (link)

close #2782

Changelog

🤖 Generated by Copilot at bb67b16

Improved the visibility and appearance of the terminal resize handle by changing its background color to match the terminal border color. Removed an empty change to packages/terminal-next/src/browser/terminal.color.ts.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (3a2edd8) 57.68% compared to head (bb67b16) 57.69%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2783   +/-   ##
=======================================
  Coverage   57.68%   57.69%           
=======================================
  Files        1336     1336           
  Lines       83865    83865           
  Branches    17432    17432           
=======================================
+ Hits        48381    48382    +1     
+ Misses      32253    32252    -1     
  Partials     3231     3231           

Flag	Coverage Δ
jsdom	52.71% <ø> (+<0.01%)	⬆️
node	16.79% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ckages/terminal-next/src/browser/terminal.color.ts	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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