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, 5 insertions, 8 deletions

diff --git a/main/mdns_service.c b/main/mdns_service.c
index 21cd464..05d8c23 100644
--- a/main/mdns_service.c
+++ b/main/mdns_service.c
@@ -17,6 +17,8 @@ static const uint16_t PORT   = 80;
 // Pull hostname + TXT values from viewport_state under one lock acquisition,
 // then push them at the mDNS service. mdns_service_add() rejects with
 // INVALID_ARG if the hostname isn't set, so order matters on first apply.
+// viewport_name is always populated (MAC-derived default) so the hostname
+// is always `viewport-<name>`.
 static esp_err_t apply_state(bool include_hostname)
 {
     char hostname[80];
@@ -25,11 +27,8 @@ static esp_err_t apply_state(bool include_hostname)
 
     viewport_state_lock();
     viewport_state_t *st = viewport_state_get();
-    snprintf(hostname, sizeof(hostname), "viewport%s%s",
-             st->viewport_name[0] ? "-" : "",
-             st->viewport_name[0] ? st->viewport_name : "");
-    snprintf(name, sizeof(name), "%s",
-             st->viewport_name[0] ? st->viewport_name : "");
+    snprintf(hostname, sizeof(hostname), "viewport-%s", st->viewport_name);
+    snprintf(name,     sizeof(name),     "%s",         st->viewport_name);
     resolution  = viewport_state_resolution_str();
     orientation = (st->orientation == VIEWPORT_ORIENTATION_PORTRAIT)
                       ? "portrait" : "landscape";
@@ -53,9 +52,7 @@ esp_err_t mdns_service_start(void)
     char hostname[80];
     viewport_state_lock();
     viewport_state_t *st = viewport_state_get();
-    snprintf(hostname, sizeof(hostname), "viewport%s%s",
-             st->viewport_name[0] ? "-" : "",
-             st->viewport_name[0] ? st->viewport_name : "");
+    snprintf(hostname, sizeof(hostname), "viewport-%s", st->viewport_name);
     viewport_state_unlock();
 
     ESP_RETURN_ON_ERROR(mdns_init(),                       TAG, "mdns_init");