fix(tts): stop settings-save from resetting nexttime; bump v0.2.4.2-alpha

applyComposeSettings() and the legacy dialog save handler both called
  nexttime = System.currentTimeMillis() + cursep;
on every save — including on every slider tick and every app-resume that
reloads settings. This stamped a full separation-period blackout on the
rate limiter unconditionally, so 9 readings could be suppressed before
the first speak and after every settings interaction.

Trace evidence: 71 glucose notifications, only 7 spoken, first speak at
T+607 s despite nexttime=0 at init — a settings reload at app resume had
set nexttime = T_resume + cursep before the first glucose arrived.

Fix: remove the nexttime assignment from both save paths. cursep is still
updated so the correct interval takes effect immediately; nexttime advances
only inside selspeak() after a reading is actually announced.

Remaining nexttime write sites after this change:
  selspeak()             — advances gate after each spoken reading  ✓
  SuperGattCallback L494 — resets to 0 when alarm speech starts     ✓
  volatile static init   — initial zero                             ✓

Bump: versionCode 8241 → 8242, versionName 0.2.4.1 → 0.2.4.2-alpha

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Rob

Common/build.gradle

@@ -89,8 +89,8 @@ android {
         //compileSdk 36
         applicationId "cloud.glucodroid"
 
-         versionName '0.2.4.1-alpha'
-        versionCode 8241
+         versionName '0.2.4.2-alpha'
+        versionCode 8242
 //    multiDexEnabled true
 
         buildConfigField 'String', 'BUILD_TIME', 'new java.text.SimpleDateFormat("HH:mm:ss dd-MMM-yyyy").format(new java.util.Date(' + System.currentTimeMillis() + 'L))'

Common/src/main/java/tk/glucodata/Talker.java

@@ -255,7 +255,6 @@ public static void applyComposeSettings(Context context, boolean speakGlucose, b
     curspeed=speed;
     curpitch=pitch;
     cursep=Math.max(1,separationSeconds)*1000L;
-    nexttime=System.currentTimeMillis()+cursep;
     if(selectedVoice>=0)
         voicepos=selectedVoice;
 
@@ -873,8 +872,6 @@ public  void onNothingSelected (AdapterView<?> parent) {
              var str = separation.getText().toString();
             if(str != null) {
                 cursep = Integer.parseInt(str)*1000L;
-                var now=System.currentTimeMillis();
-                nexttime=now+cursep;
                 }
             var speedstr=((EditText)speeds[1]).getText().toString();
             if(speedstr != null) {