feat: click-to-seek + warm monochrome lyric colors

[slashome]

Summary

• Lyric colors: switched from theme-dependent ANSI named colors to a faintly beige white gradient (redefined via curses.init_color, falling back to the xterm 256-color grayscale ramp, then the base palette). Fixes the dull/washed-out look and the greenish "past" lines that came from the theme rendering COLOR_CYAN as teal.
• Click-to-seek: click a lyric line to jump playback to that line's timestamp (offset-aware), or click anywhere on the progress bar to seek to that fraction of the track. Mouse events via curses.mousemask; the row→timestamp map and bar span are rebuilt each frame.
• Ctrl+C: wrapped curses.wrapper so quitting with Ctrl+C no longer dumps a KeyboardInterrupt traceback.
• README: new screenshot showing the album cover, plus a recommendation to run in Kitty for the best rendering.

Test

• Ran from source in Kitty against a live MPD; verified the beige gradient, clicking lyric lines, and clicking the progress bar all seek correctly.

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