feat: add deep link support for audio position (t= param) and set default transcript rows to 2

app.js

@@ -78,6 +78,41 @@ function formatTime(seconds) {
   return `${mins}:${String(secs).padStart(2, "0")}`;
 }
 
+// Parse time from string: supports seconds (120), m:ss (2:30), h:mm:ss (1:30:45)
+function parseTimeString(timeStr) {
+  if (!timeStr) return null;
+  const parts = timeStr.split(":").map(Number);
+  if (parts.some(isNaN)) return null;
+  if (parts.length === 1) return parts[0]; // seconds only
+  if (parts.length === 2) return parts[0] * 60 + parts[1]; // m:ss
+  if (parts.length === 3) return parts[0] * 3600 + parts[1] * 60 + parts[2]; // h:mm:ss
+  return null;
+}
+
+// Get time parameter from URL (supports ?t=120 or #t=120)
+function getTimeFromURL() {
+  const params = new URLSearchParams(window.location.search);
+  const queryTime = params.get("t");
+  if (queryTime) return parseTimeString(queryTime);
+  
+  const hash = window.location.hash.slice(1); // remove #
+  const hashParams = new URLSearchParams(hash);
+  const hashTime = hashParams.get("t");
+  if (hashTime) return parseTimeString(hashTime);
+  
+  return null;
+}
+
+// Update URL with current time (uses hash to avoid page reload)
+function updateURLTime(seconds) {
+  if (!Number.isFinite(seconds) || seconds < 0) return;
+  const time = Math.floor(seconds);
+  const newHash = `t=${time}`;
+  if (window.location.hash !== `#${newHash}`) {
+    history.replaceState(null, "", `#${newHash}`);
+  }
+}
+
 function hashString(input) {
   let hash = 0;
   for (let i = 0; i < input.length; i += 1) {
@@ -786,12 +821,31 @@ async function init() {
     playPause.textContent = "Play";
   });
   audio.addEventListener("loadedmetadata", () => {
-    // Start at configured offset, but don't exceed audio duration
+    // Check URL for deep link time first
+    const urlTime = getTimeFromURL();
+    if (urlTime !== null && Number.isFinite(audio.duration) && audio.duration > 0) {
+      audio.currentTime = Math.min(urlTime, audio.duration - 0.1);
+      return;
+    }
+    // Fall back to configured offset, but don't exceed audio duration
     if (Number.isFinite(audio.duration) && audio.duration > 0 && START_OFFSET_SECONDS > 0) {
       audio.currentTime = Math.min(START_OFFSET_SECONDS, audio.duration - 1);
     }
   });
 
+  // Update URL when user seeks (manual scrub or click)
+  audio.addEventListener("seeked", () => {
+    updateURLTime(audio.currentTime);
+  });
+
+  // Handle hash changes (when user modifies URL directly)
+  window.addEventListener("hashchange", () => {
+    const urlTime = getTimeFromURL();
+    if (urlTime !== null && Number.isFinite(audio.duration)) {
+      audio.currentTime = Math.min(urlTime, audio.duration - 0.1);
+    }
+  });
+
   if (configToggle && configPanel) {
     configToggle.addEventListener("click", () => {
       configPanel.classList.toggle("open");

config.js

@@ -57,7 +57,7 @@ const CONFIG = {
   // ===================
   
   transcript: {
-    rows: 6,           // Number of transcript lines shown (2-12)
+    rows: 2,           // Number of transcript lines shown (2-12)
     opacity: 0.25,     // Transcript panel opacity (0.2-1.0)
     size: "medium",    // Text size: "small", "medium", "large"
   },