[NEB-219] Nebula: Update theming

[MananTank]

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PR-Codex overview

This PR focuses on enhancing the Nebula application by introducing a new color scheme, refining components, and improving accessibility. It adds a nebula-pink color variant, modifies component styles, and updates layouts for better user experience.

Detailed summary

• Added ::selection style in nebula-global.css.
• Introduced nebula-pink color variant in tailwind.config.js.
• Exported useIsClientMounted function in ClientOnly.tsx.
• Updated global CSS variables for nebula-pink-foreground.
• Modified button styles to utilize nebula-pink.
• Adjusted layout and component styles for better aesthetics and usability.
• Enhanced accessibility by refining header and button elements.
• Implemented a theme toggle button in ChatSidebar.

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[linear]

NEB-219 Rebrand and theming (first iteration)

[changeset-bot]

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Latest commit: 3d2324d

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[MananTank]

• [NEB-206] Nebula: UI element position tweaks in chat textarea #6886
• [NEB-219] Nebula: Update theming #6885 👈 (View in Graphite)
• main

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.22%. Comparing base (c137dd6) to head (3d2324d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6885   +/-   ##
=======================================
  Coverage   55.22%   55.22%           
=======================================
  Files         896      896           
  Lines       57042    57042           
  Branches     3952     3952           
=======================================
  Hits        31499    31499           
  Misses      25447    25447           
  Partials       96       96           

Flag	Coverage Δ
packages	55.22% <ø> (ø)

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[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
thirdweb (esm)	51.19 KB (0%)	1.1 s (0%)	164 ms (+130.06% 🔺)	1.2 s
thirdweb (cjs)	143.86 KB (0%)	2.9 s (0%)	303 ms (+58.25% 🔺)	3.2 s
thirdweb (minimal + tree-shaking)	5.67 KB (0%)	114 ms (0%)	72 ms (+1354.44% 🔺)	185 ms
thirdweb/chains (tree-shaking)	514 B (0%)	11 ms (0%)	26 ms (+1572.85% 🔺)	36 ms
thirdweb/react (minimal + tree-shaking)	19.38 KB (0%)	388 ms (0%)	120 ms (+804.82% 🔺)	507 ms