* fix(computer): verify macOS type-text and paste-text sent as keys by reading the field back
When text can't be written through AXValue (Chromium/Electron fields, fields
that refuse the write), type-text and paste-text send keys or Cmd+V and always
reported unverified. Now the helper predicts the focused field's value from its
value and selection before sending, then reads it back until it settles:
verified on a match, unverified (text_mismatch) otherwise. Secure fields and
fields without a readable value and selection stay unverified as before, and
the result never repeats the typed text or the field's contents.
* fix(computer): keep the caret put after a refused macOS text write and skip unprovable readbacks
A refused AX value write no longer moves the caret before falling back to keys, so the keys and the prediction both use the user's selection. Text with control characters, a value the field already holds, and a field still filling at the 2 s cap stay unverified rather than verified or text_mismatch. The quiet window starts after the first read answers.
* fix(computer): bound macOS text readback size and say a mismatch can mean keys went elsewhere
* fix(computer): treat a macOS text readback past the cap as undetermined
