Default name = MAC; brief wake on boot; drop dead touch defences

- Seed viewport_name with the full base MAC, colons stripped
  (e8:f6:0a:e0:90:94 → "e8f60ae09094"). Stable across reboots, globally
  unique, 12 alphanumeric chars — well inside the mDNS hostname limit
  even with the "viewport-" prefix.
- Add a mac_str field to viewport_state and expose it as the new "mac"
  key in GET /state and as a "mac" line on the info screen.
- "Configured" no longer requires a viewport_name (it always has the
  MAC default); the scrypted URL alone gates outbound POSTs and the
  loading-vs-info screen choice.
- Strip viewport_name[0] fallbacks in http_api / mdns / local_screens
  now that the field is never empty.
- Replace the wake-on-boot-stays-on behaviour with a ~600 ms flash
  followed by sleep — long enough for the FT5426 touch IC to come out
  of its initial unresponsive state, short enough that an idle device
  doesn't burn the backlight.
- Drop the touch defensive cruft added when we were chasing a PoE-power
  theory: the DEV_MODE=0x00 write at init, the touch_reset_pulse() call
  at init, and the runtime wedge-self-heal in the polling loop didn't
  actually fix anything — the wake-on-boot flash did. Also delete the
  display_touch_reset_pulse() helper since it now has zero callers.

1 files changed, 8 insertions, 5 deletions

diff --git a/main/app_main.c b/main/app_main.c
index c411c46..a60496d 100644
--- a/main/app_main.c
+++ b/main/app_main.c
@@ -103,13 +103,16 @@ static void display_setup_task(void *arg)
 
     ESP_LOGI(TAG, "display subsystems [%s] up", flags);
 
-    // Wake the display on boot. Empirically the FT5426 touch IC only
-    // reports contacts when the LCD is actively streaming with the
-    // backlight on — booting straight into ASLEEP leaves taps silently
-    // unread. The idle timer (idle_timeout_ms) puts the device back to
-    // sleep on its own if nothing happens.
+    // Briefly wake the display on boot so the FT5426 touch IC can come
+    // out of its initial unresponsive state — empirically it only
+    // reports contacts when the LCD has been actively streaming with
+    // the backlight on at least once since power-up. A 600 ms flash is
+    // enough; we then sleep so an idle device doesn't burn the
+    // backlight until the idle timer fires.
     if (dsp_err == ESP_OK) {
         state_machine_set(VIEWPORT_STATE_AWAKE);
+        vTaskDelay(pdMS_TO_TICKS(600));
+        state_machine_set(VIEWPORT_STATE_ASLEEP);
     }
 
     vTaskDelete(NULL);