thinkingTokensRow/statusRow/pluginInstallRow were three copy-pasted
module-level row/text pairs implementing the same 'collapse repeated
ticks into one updating row' pattern. Extracted a small makeCoalescer(cls,
icon) factory returning an update(api, text) closure; each call site is
now a single line instead of the duplicated guard-and-update-or-create
block against api.mutableRow.