Experiment with a true-black dark theme

[t3dotgg]

What Changed

• Switch dark-mode app and browser chrome backgrounds from gray to true black.
• Use a restrained near-black surface scale for the sidebar, cards, composer, and popovers.
• Flatten the dark composer, give it a dedicated near-black surface, and replace the blue focus border with a neutral hairline.
• Recalibrate muted text for legibility on black and disable the full-screen grain/noise overlay.
• Leave light mode and layout behavior unchanged.

Why

This is a focused experiment toward the cleaner, true-black visual treatment in the attached ChatGPT references. It keeps the existing component structure and spacing while removing effects that were compensating for the old gray foundation.

UI Changes

Before

After

Validation

• vp check
• vp run typecheck
• vp run --filter @t3tools/web build

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• Video is not applicable; there are no animation or interaction changes

Note

Switch dark mode theme to true black background

• Sets dark mode background to pure black (#000000) in index.html (meta theme-color tags and inline boot script) and index.css (--background: var(--color-black)).
• Dark mode card and popover surfaces use --color-neutral-900 instead of the previous lighter gray.
• Chat composer in dark mode drops blur/shadow effects and uses --card/--background colors directly; body::after is suppressed in dark mode.
• Behavioral Change: dark mode UI surfaces are visually darker across the app, and the chat composer no longer applies backdrop-filter blur.

^{Macroscope summarized 4b4efa0. (Automatic summaries will resume when PR exits draft mode or review begins).}

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✨ Finishing Touches

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