feat(desktop): refine UI with flatter Claude/Cursor aesthetic

[iotserver24]

Refined the desktop React UI to match the user's preference for a minimalist, grayscale dark-mode aesthetic similar to Claude Desktop or Cursor. Changes include softening borders, using flatter zinc background shades, and removing harsh separations between layout panels. Verified UI visually with Playwright.

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PR created automatically by Jules for task 17661739527306901514 started by @iotserver24

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