Speech settings updated, no large decimals for settings. Also changing with quick settings keys now applies across window changes.

docs/testing/speech-preferences.md

@@ -41,3 +41,9 @@ ordinary speech returns to its normal pitch, and Tab/Shift+Tab retain sensible
 labels and values. Check Braille if used. These checks also cover existing
 profiles with explicit values; the automated harness does not establish audible
 speech, physical input or physical Braille acceptance.
+
+Speech numbers use at most one decimal place. After repeated slider changes,
+check pitch and volume with the quick speech keys, then save and reopen the
+settings. Values such as 4.5 must remain 4.5 in announcements and TOML rather
+than exposing floating-point tails. Check all voice types and custom key echo;
+untouched inherited values must remain unset.