feat: add VSCode Dark+ theme

[DBinK]

What

Adds a faithful vscode-dark-plus theme reproducing the VS Code Dark+ palette
end to end, sourced from the official VS Code theme files:

• Editor/workbench colors from dark_plus.json / dark_vs.json — editor
  #1E1E1E background, #D4D4D4 foreground, #264F78 selection, #094771
  active list selection, #37373D selected tab, iconic #007ACC status bar.
• Syntax tokens from Dark+ tokenColors — comment #6A9955, string
  #CE9178, keyword.control #C586C0, function #DCDCAA, type #4EC9B0,
  variable #9CDCFE, constant/builtin #4FC1FF, tag #569CD6.
• Terminal ANSI palette from VS Code's terminalColorRegistry.ts dark
  defaults (red #CD3131, green #0DBC79, bright red #F14C4C, ...).
• Bracket pair colors #FFD700 / #DA70D6 / #179FFF (Dark+ bracket
  highlight palette).

Why

default-dark.json reuses several Dark+ syntax colors but diverges on the
workbench and terminal surfaces, and colors keyword blue (#569CD6)
where Dark+ uses purple (#C586C0) for control flow. This theme gives the
actual Dark+ look across editor, tabs, sidebar, dialogs, status bar, and
terminal.

Usage

Select in settings.json:

{ "theme": "vscode-dark-plus" }

It is discovered automatically via the embedded themes FS
(go:embed *.json), so it also appears in the theme selector.

Verification

• TestBundledThemesLoad and
  TestBundledThemeSemanticDiffForegroundsMeetNormalTextContrast pass with
  the new theme included.
• Built and smoke-tested: --size 80x30 --exec render of a Go file with the
  theme selected.
• LoadTheme("vscode-dark-plus") resolves Dark+ signature colors (keyword
  #c586c0, status bar #007acc, terminal red #cd3131).

Sources

• VS Code Dark+ theme:
  https://github.com/microsoft/vscode/blob/main/extensions/theme-defaults/themes/dark_plus.json
• VS Code Dark workbench colors:
  https://github.com/microsoft/vscode/blob/main/extensions/theme-defaults/themes/dark_vs.json
• VS Code terminal ANSI palette:
  https://github.com/microsoft/vscode/blob/main/src/vs/workbench/contrib/terminal/common/terminalColorRegistry.ts

[coderabbitai]

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Reviewing files that changed from the base of the PR and between c91dedb and 8182736.

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• internal/config/themes/vscode-dark-plus.json

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📝 Walkthrough

Walkthrough

Adds a new VS Code Dark Plus theme configuration. The file defines UI colors, editor and syntax colors, terminal ANSI colors, and ASCII border characters.

Changes

VS Code Dark Plus theme

Layer / File(s)	Summary
UI theme colors internal/config/themes/vscode-dark-plus.json	Defines base colors and styles for tabs, sidebar, dialogs, menus, status elements, diffs, and scrollbars.
Editor and syntax colors internal/config/themes/vscode-dark-plus.json	Defines editor state colors, bracket colors, and syntax token colors.
Terminal and border settings internal/config/themes/vscode-dark-plus.json	Defines terminal foreground and background colors, a 16-color ANSI palette, and box-drawing border characters.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 81827

This adds a bundled VS Code Dark+ theme configuration. No current merge-blocking correctness, security, or runtime risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a VS Code Dark+ theme.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[eugenioenko]

Hi @DBinK, thank you for putting this together! Really appreciate the thoughtful contribution :)

Happy to add this one to the core of ttt. Default Dark was inspired by VS Code's dark theme but, as you pointed out, it's not exactly the same.

If you're up for making more themes, there's a collection of community themes that ship as downloadable JSON rather than in the binary. The files live in config/themes/ and users install them with a one-line curl into ~/.config/ttt/themes/. Adding one is a .json in that folder plus a gallery entry in extra-themes.md; we can help generate the preview image.

Thanks for helping make ttt better for the community!

PS: next release gonna have the option to set background color as transparent so that should also allow for new theme styles. VScode Dark Plus looks fantastic with a dark background out of the box ^^