fix(tag): disable GPIO0 deep sleep (floats LOW), extend timeouts

- GPIO0 deep sleep trigger disabled (#if 0) — pin has no pull-up
- Display timeout default: 30s → 3600s (1 hour)
- DW1000 sleep timeout: 5min → 1 hour
- Tag now stays awake and visible on boot

esp32/uwb_tag/src/main.cpp

@@ -321,7 +321,7 @@ static uint32_t      g_pimu_last_rx_ms = 0;
 #define BLE_PIMU_UUID  "12345678-1234-5678-1234-56789abcdef4"
 
 #define CFG_NVS_NS                 "uwb_cfg"
-#define CFG_DEFAULT_SLEEP_S        30
+#define CFG_DEFAULT_SLEEP_S        3600   /* 1 hour display timeout default */
 #define CFG_DEFAULT_BRIGHTNESS     200
 #define CFG_DEFAULT_CHANNEL        5
 #define CFG_DEFAULT_RANGING_MS     100
@@ -675,7 +675,7 @@ static void estop_check(void) {
 
 /* ── Power Management ────────────────────────────────────────────── */
 
-#define PM_DW1000_SLEEP_MS       (300UL * 1000)
+#define PM_DW1000_SLEEP_MS       (3600UL * 1000)  /* 1 hour idle before DW1000 sleep */
 #define PM_DW1000_WAKE_PERIOD_MS (30UL  * 1000)
 #define PM_DW1000_WAKE_WINDOW_MS  5000
 #define PM_DEEP_SLEEP_HOLD_MS     3000
@@ -779,7 +779,12 @@ static void pm_update(void) {
         }
     }
 
-    /* GPIO0 hold 3s → deep sleep */
+    /*
+     * GPIO0 deep sleep DISABLED — pin floats LOW on this board
+     * (no external pull-up), causing immediate sleep on boot.
+     * Deep sleep can be re-enabled once a 10kΩ pull-up is soldered.
+     */
+    #if 0
     if (digitalRead(PIN_ESTOP) == LOW) {
         if (g_btn_held_ms == 0) {
             g_btn_held_ms = now;
@@ -796,6 +801,7 @@ static void pm_update(void) {
         }
         g_btn_held_ms = 0;
     }
+    #endif
 }
 
 /* ── OLED display (5 Hz) ────────────────────────────────────────── */