Implement browser-based voice notes recording, standby flicking remembrance candle, and favorite memory pinning

sound_picture_app/sound_picture_app.ino

@@ -28,6 +28,11 @@ static bool     g_tributeActive    = false;
 static int      g_tributeNextIndex = 0;
 static uint32_t lastTributeCheck   = 0;
 
+// Standby Remembrance Candle State
+static bool     g_standbyActive      = false;
+static uint32_t lastInteractionTime  = 0;
+static const uint32_t STANDBY_TIMEOUT = 120000; // 2 minutes standby timeout
+
 // ── Core function: show a memory ──────────────────────────────────────────────
 void showMemory(int index) {
   if (g_memoryCount == 0) return;
@@ -36,6 +41,9 @@ void showMemory(int index) {
 
   printf("Showing memory %d: '%s'\r\n", index, g_memories[index].name);
 
+  g_standbyActive = false;
+  lastInteractionTime = millis();
+
   stopAudio();
   Display_Memory_Photo(index);
   playMemoryAudio(index);
@@ -110,12 +118,26 @@ void setup() {
   initAudioPlayer();
   setPlayerVolume(g_volume);
 
-  // Show first memory (or error screen)
+  // Show favorite memory or first memory on startup
   if (g_memoryCount == 0) {
     printf("No memories found. Add some via the web app.\r\n");
-    // Screen stays dark — user will add via web
+    g_standbyActive = true;
+    Draw_Candle_Body();
   } else {
-    showMemory(g_currentIndex);
+    int favoriteIndex = -1;
+    if (g_favoriteMemoryId >= 0) {
+      for (int i = 0; i < g_memoryCount; i++) {
+        if (g_memories[i].id == g_favoriteMemoryId) {
+          favoriteIndex = i;
+          break;
+        }
+      }
+    }
+    if (favoriteIndex >= 0) {
+      showMemory(favoriteIndex);
+    } else {
+      showMemory(g_currentIndex);
+    }
   }
 
   // Start WiFi + web server
@@ -160,6 +182,8 @@ void loop() {
   // ── Button edge detection ─────────────────────────────────────────────────
   if (btn == LOW && lastButtonState == HIGH) {
     // Pressed down
+    lastInteractionTime = now;
+    g_standbyActive      = false;
     buttonPressStartTime = now;
     isButtonPressed      = true;
     longPressTriggered   = false;
@@ -210,6 +234,24 @@ void loop() {
     }
   }
 
+  // ── Standby Candle Controller ─────────────────────────────────────────────
+  if (g_memoryCount == 0) {
+    if (!g_standbyActive) {
+      g_standbyActive = true;
+      Draw_Candle_Body();
+    }
+  } else if (!g_standbyActive && !isAudioPlaying() && currentState == STATE_IDLE && !g_tributeActive) {
+    if (now - lastInteractionTime > STANDBY_TIMEOUT) {
+      g_standbyActive = true;
+      Draw_Candle_Body();
+      printf("Standby: entering candle standby mode\r\n");
+    }
+  }
+
+  if (g_standbyActive) {
+    Draw_Candle_Flicker();
+  }
+
   lastButtonState = btn;
 
   // ── Web server ────────────────────────────────────────────────────────────