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Cmd +/- zoom scales the root <html> font-size (rem-only by design), but PR #891 converted the message-timeline + thread render path from rem tokens to hardcoded px (text-[15px]/text-[13px], font-size: 15px), freezing that text against zoom. Preserve Kenny's 15px chat sizing intent but express it in rem so it scales: add rem-based `text-chat` (0.9375rem === 15px) and `text-code` (0.8125rem === 13px) Tailwind tokens, and swap the px classes over in MessageRow, markdown, mentionChip, and globals.css (.mention-highlight). Codify it: add `pnpm check:px-text` CI guard flagging new px text in the timeline/thread render path, wired into `pnpm check`, plus an AGENTS.md note steering future agents to rem tokens. Scoped to the regression footprint — no app-wide sweep. Co-authored-by: Taylor Ho <taylorkmho@gmail.com> Signed-off-by: Taylor Ho <taylorkmho@gmail.com>