storage.sync rejects any item over 8192 bytes, and the options page
writes every field in one set(). An oversized template therefore made
every later save fail, including changes to unrelated settings, with
only a brief "Could not save settings".
Cap the template at 1,000 UTF-16 units: maxlength on the input, and
mergeSettings falls back to the default for a longer stored value, as it
does for other out-of-range settings. Even a template of pasted control
characters (six bytes each once JSON-escaped) stays under the quota; a
test pins that arithmetic and another ties the HTML maxlength to the
constant.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
ChatGPT can require signing in, and it does not always send a prefilled
prompt. The README and options panel mentioned pressing Enter only in
passing. Give both a prominent note covering sign-in and Enter or Send,
and drop the inline mentions it replaces.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
