Stop back-dating flicks, and give the half-volley rescue the right deadline

Oliver's v367 log: every 62-64 ms flick landed 76-92 ms early and a 97 ms
one whiffed — v366's touch-down timing for flicks was wrong; a flick is
timed by its swipe (flickLead now 0, the age is still logged). The
early-swing half-volley rescue checked the bounce against the long volley
window and then expired on the bounce frame; it now uses the shorter
groundstroke window. The log also records where he stood when the
opponent struck and where the auto-run was taking him on a miss. v368.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

index.html

@@ -1140,6 +1140,6 @@ if (location.hostname !== 'splatter-tennis.wuwi.one' && !window.Capacitor?.isNat
   </div>
 </div>
 <span id="recLamp" hidden>REC</span>
-<script type="module" src="src/main.js?v=367"></script>
+<script type="module" src="src/main.js?v=368"></script>
 </body>
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