feat(practice): flag suspiciously short laps and remove any lap in one click

Practice laps under 85% of the driver's own median (a likely shortcut)
are flagged: counted, but never a best lap, record or training stat
until approved. Timing and Race Day get a one-click Approve/Remove
panel, overlays show a warning mark, and any lap can be removed or
restored from Timing and Judging with undo.

Also sends judge corrections straight to the server so its hot-results
protection can no longer hold back a correction made right after a
passing.

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

tests/browser_fake_decoder.js

@@ -40,8 +40,9 @@ export async function startFakeDecoder() {
     // listening so the frontend's own reconnect logic has somewhere to reconnect to.
     dropConnections: () => { for (const socket of sockets) socket.destroy(); },
     // Sends an AMMC-style PASSING message as an unmasked server->client WebSocket text frame.
-    sendPassing: (transponder) => {
-      const payload = Buffer.from(JSON.stringify({ msg: "PASSING", transponder: String(transponder), rtc_time: new Date().toISOString() }));
+    // `at` (ms) sets the decoder's own passing time, for exact lap times in a test.
+    sendPassing: (transponder, at = Date.now()) => {
+      const payload = Buffer.from(JSON.stringify({ msg: "PASSING", transponder: String(transponder), rtc_time: new Date(at).toISOString() }));
       const header = payload.length < 126
         ? Buffer.from([0x81, payload.length])
         : Buffer.from([0x81, 126, payload.length >> 8, payload.length & 0xff]);