Light: warm neutrals (#e4e0d8 borders, #f4f2ec code, #6b7a62 muted) instead of
near-blacks; links use the dashboard's #4e7a4d (4.7:1 on cream).
Dark: replace Material's cold blue-grey slate (#1e2129 page) with the chat
overlay's deep-pine palette (#22271f page, #e8f5e8 text, #7ab87a accent), so a
dark screen reads as the co-op's green identity rather than stock Material.
