M3 done: drop boot test, fold BOOT button into touch long-press

The Waveshare ESP32-P4-ETH board exposes BOOT on GPIO 35, but at runtime
that pin is owned by the EMAC TXD1 signal. No usable GPIO is wired to a
separate user button, so the BOOT-button task could never fire.

Move both BOOT-button behaviours onto the touch panel:
  - ≥1.5s hold → 15s identity overlay (was BOOT short-press)
  - ≥5s hold   → factory reset (was BOOT long-hold)
Short tap (<500ms) still toggles wake/sleep. Long-press fires while the
finger is still down so the user gets immediate feedback at each
threshold.

Also strip the R/G/B 6 s boot test sequence — the panel now renders
correctly, so it's no longer useful diagnostically.

Boot subsystem flags drop the trailing B column: [EMHDJT].

1 files changed, 2 insertions, 3 deletions

diff --git a/main/local_screens.h b/main/local_screens.h
index f1e4876..e2d6ca1 100644
--- a/main/local_screens.h
+++ b/main/local_screens.h
@@ -15,7 +15,7 @@ esp_err_t local_screens_init(void);
 //   <current IP>                ("no network" if no DHCP lease)
 //   <state>                     ("awake" / "asleep" / "unconfigured")
 // Font scale is auto-picked to fit the longest line within 90% of width.
-// Shown on first boot, after factory reset, and as a 15s BOOT-button overlay.
+// Shown on first boot, after factory reset, and as a 15s touch-long-press overlay.
 esp_err_t local_screens_show_ip(void);
 
 // Render the loading screen — centered "Loading…" — shown on every wake
@@ -23,8 +23,7 @@ esp_err_t local_screens_show_ip(void);
 esp_err_t local_screens_show_loading(void);
 
 // Show the identity ("who am I") screen for `duration_ms`, then drop the
-// backlight off. Used by the BOOT button short-press (any state) and by
-// the touch handler when the device is unconfigured.
+// backlight off. Triggered by a ≥1.5s touch long-press in any state.
 esp_err_t local_screens_overlay(uint32_t duration_ms);
 
 // True while the identity overlay is currently shown (timer armed).