fix(theme): preserve transparent terminal backgrounds

[eugenioenko]

Why

Bundled themes that explicitly set terminal.background override the terminal emulator default. When the host terminal uses a transparent background, opening the integrated terminal therefore paints an opaque editor-colored background instead of preserving that transparency.

What changed

• removed explicit terminal backgrounds from the nine affected bundled themes, matching default-dark
• retained each theme-specific terminal foreground and ANSI palette
• added a bundled-theme assertion to prevent explicit terminal backgrounds from returning

Testing

• go test ./internal/config — proves every embedded theme parses and leaves terminal.background unset
• make test — full Go and E2E regression suite
• make lint
• make build
• started the built binary with an isolated config directory and completed a scripted --exec session

Screenshot

Not included: text screenshots from the headless --exec screen do not capture host-terminal transparency or background composition.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between b901ec6 and 0deb2aa.

📒 Files selected for processing (10)

• internal/config/theme_test.go
• internal/config/themes/dracula.json
• internal/config/themes/high-contrast-dark.json
• internal/config/themes/high-contrast-light.json
• internal/config/themes/nord.json
• internal/config/themes/rainy-day-dark.json
• internal/config/themes/rainy-day.json
• internal/config/themes/turbo-vision.json
• internal/config/themes/vscode-dark-plus.json
• internal/config/themes/zenith.json

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