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, 2 insertions, 1 deletions

diff --git a/main/viewport_state.h b/main/viewport_state.h
index 4e6fbd6..264d07d 100644
--- a/main/viewport_state.h
+++ b/main/viewport_state.h
@@ -20,7 +20,8 @@ typedef enum {
 // Read-mostly snapshot of device state used by /state. Counters are
 // updated under a mutex by the modules that own them.
 typedef struct {
-    char     viewport_name[64];         // empty before /config
+    char     mac_str[18];               // "aa:bb:cc:dd:ee:ff" — populated at init
+    char     viewport_name[64];         // MAC-derived default; can be overridden via /config
     char     scrypted_url[256];         // empty before /config
     bool     configured;
     viewport_run_state_t state;