PR #106445's effect was inserted above `reconnectPty` / `startFreshPty` /
`startFreshDashboardChat`. React Compiler's `react-hooks/immutability`
rule then treats `ptyInputLineRef` and `mobileReplacementInputUntilRef`
as effect-owned values and flags the six pre-existing assignments in
those callbacks as errors ("This value cannot be modified"), which is
what turned the `JS & TS checks` job red. Declaring the effect after the
callbacks keeps the rule quiet; eslint on the file is back to main's
0 errors / 3 warnings.
Adds one pure-function vitest on `normalizePtyMobileInput` proving the
symptom: a stale tracked line ("hel") makes an in-window re-emission of
"hello" come out as 3×DEL + "hello", which over a composer already
holding "hello" leaves "hehello"; with the tracker reset the same input
passes through untouched.
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