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, 6 insertions, 3 deletions

diff --git a/main/local_screens.c b/main/local_screens.c
index f25754d..5c72f26 100644
--- a/main/local_screens.c
+++ b/main/local_screens.c
@@ -199,6 +199,7 @@ esp_err_t local_screens_show_info(void)
     // is on a 3 KiB stack and can't carry ~1.6 KiB of locals here. Single
     // caller protected by display ownership, so static is fine.
     static char vp_name[64];
+    static char mac_str[18];
     static char scrypt[256];
     static char lines[INFO_MAX_LINES][INFO_LINE_BYTES];
     bool configured;
@@ -212,8 +213,10 @@ esp_err_t local_screens_show_info(void)
     viewport_state_lock();
     viewport_state_t *st = viewport_state_get();
     strncpy(vp_name, st->viewport_name, sizeof(vp_name));
+    strncpy(mac_str, st->mac_str,       sizeof(mac_str));
     strncpy(scrypt,  st->scrypted_url,  sizeof(scrypt));
     vp_name[sizeof(vp_name) - 1] = '\0';
+    mac_str[sizeof(mac_str) - 1] = '\0';
     scrypt[sizeof(scrypt)   - 1] = '\0';
     configured = st->configured;
     state      = st->state;
@@ -237,8 +240,7 @@ esp_err_t local_screens_show_info(void)
     // 8-char label is prefixed. Long names get visibly truncated; ok for
     // an info dump on a 480-wide screen.
     char host[32];
-    if (vp_name[0]) snprintf(host, sizeof(host), "viewport-%.15s.local", vp_name);
-    else            snprintf(host, sizeof(host), "viewport.local");
+    snprintf(host, sizeof(host), "viewport-%.15s.local", vp_name);
 
     char scrypt_short[32];
     if (!scrypt[0]) {
@@ -292,7 +294,8 @@ esp_err_t local_screens_show_info(void)
             snprintf(lines[n_lines++], INFO_LINE_BYTES, fmt, ##__VA_ARGS__); \
     } while (0)
 
-    ADD("name    %s",  vp_name[0] ? vp_name : "unset");
+    ADD("name    %s",  vp_name);
+    ADD("mac     %s",  mac_str);
     ADD("host    %s",  host);
     ADD("ip      %s",  (ip && ip[0]) ? ip : "no network");
     ADD("state   %s",  state_str);