v1.7.0

Fixes

• TUI: emphasized text invisible on light terminal themes. Workspace names, titles and dialog highlights hardcoded Color::White, making them invisible on light themes such as Ghostty's One Half Light. They now use the terminal's default foreground plus bold, so they stay readable on both dark and light backgrounds. (#6)

Verification

• Added a theme-layer regression test and a render-layer test (renders the real TUI and asserts no cell emits a white foreground, and that workspace names render with the default foreground + bold).
• cargo test: 88 + 2 + 16 passing.
• Visually confirmed in a real Ghostty window with the One Half Light theme.