Speak-status: drop the double-press-copy Preferences toggle

Andre confirmed (via NVDA speech history) that holding the speak-status hotkey
doesn't repeat or spam — so the defensive toggle that let users disable the
double-press-to-copy was needless configurability. Removed the Preferences
checkbox and the DoublePressStatusToCopy setting; double-press-to-copy (Andre's
own idea) stays, now simply always on. There was never any debounce/anti-spam
code to remove — the only timing is the 600 ms double-tap detection window, which
is the feature itself. Manual updated to drop the toggle line.

Held for the next release (the toggle never shipped).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/RemSound.App/MainForm.cs

@@ -3370,10 +3370,9 @@ public sealed class MainForm : Form
         var text = statusReadout.Text;
         if (string.IsNullOrWhiteSpace(text)) text = "No status information available.";
 
-        // Double press copies to the clipboard — but only if the user has left that on (Preferences →
-        // General). Read the flag only when the timing already qualifies, so a normal single press never
-        // touches the config file.
-        if (withinDoublePressWindow && AppConfig.Load().DoublePressStatusToCopy)
+        // A quick second press copies the status to the clipboard instead of reading it again, so it can
+        // be shared. This is a deliberate double-tap, not a key repeat — a single press never reaches here.
+        if (withinDoublePressWindow)
         {
             // Second quick press: copy the status to the clipboard so it can be shared. Clipboard access
             // needs the UI thread — this runs on it (the hotkey is marshalled onto the owner form).