Update terminal dark theme background to match Termux default

[Copilot]

Changes the terminal dark theme background from #23272a (dark gray) to #000000 (pure black) to match Termux's default appearance.

Changes

• Updated background and cursorAccent in dark theme from #23272a → #000000

dark: {
  background: "#000000",  // was "#23272a"
  foreground: "#f5f5f5",
  cursor: "#4285f4",
  cursorAccent: "#000000",  // was "#23272a"
  // ...
}

Modified: src/components/terminal/terminalThemeManager.js

Original prompt

Reference: 4evernever77777/termux-releases@59eb939

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