~anthropic/claude-sonnet-latest → A (6:4)

Side A replaces an admittedly unreliable, 1800-line keystroke-transition parser graph (plus its dead ParserAction module and a Playwright race test needed only for that debounced input) with a small, testable ~90-line URL parser and a simple paste-and-go form, directly fixing a stated reliability problem with a much simpler design. Side B is a more ad-hoc refactor (bare '-theme' message) that both drops the retro theme feature and simultaneously reworks routing to a '/~/' path scheme, mixing unrelated concerns with less clear justification, though it is still a reasonable and tested change.