M8: local screens (IP + Loading) + BOOT button

local_screens.{h,c}:
- Embedded 8x8 bitmap font sized to a 95-char table; only the glyphs
  used by today's strings (viewport.local, the IPv4 string, Loading...)
  are populated. Unsupported chars render blank.
- 768 KB PSRAM scratch FB at panel-native dims.
- local_screens_show_ip() — two centered lines:
    "viewport.local"
    <current IP>
  Scale 3x portrait / 4x landscape; centered vertically.
- local_screens_show_loading() — centered "Loading..." at scale 4x/5x.
- local_screens_restore_for_state() — repaint after BOOT-overlay expiry:
  UNCONFIGURED -> IP screen; AWAKE/ASLEEP -> black FB (next /frame or
  sleep handles the rest).
- All paths go through display_present_rgb565() so orientation rotation
  is automatic.

button.{h,c}:
- Polling task at 30ms, active-low with internal pull-up.
- Short press (<5s, released) → backlight on, IP overlay for 15s via
  esp_timer one-shot, then restore.
- Hold ≥ 5s → nvs_config_reset() + esp_restart().
- PIN_BOOT_BUTTON = GPIO 0 is a TODO placeholder. ESP32-P4 strap pin
  GPIO35 is owned by RMII TXD1 at runtime so Waveshare must expose a
  separate user button on a free pin; confirm against the schematic.
  Fail-soft if mis-wired: input reads stuck-high and the task never
  fires.

state_machine on AWAKE transition now calls local_screens_show_loading()
right after display_wake() — so every wake (tap or POST /state) flashes
a clear "Loading..." until the next /frame paints over it.

app_main on boot:
- Calls local_screens_init() after display_init().
- UNCONFIGURED → paint IP screen (replaces the M3 test pattern).
- ASLEEP → backlight off (unchanged).
- After all subsystems: button_init().

Build clean against ESP-IDF 5.4 (binary ~870 KB; the font/glyph data is
under 800 bytes).

TESTING.md M8 documents the visual checks, the BOOT-pin placeholder
caveat, the AWAKE-overlay-overwrite behavior, the open follow-up about
post-overlay backlight when ASLEEP, and the font fallback policy.

1 files changed, 13 insertions, 5 deletions

diff --git a/main/app_main.c b/main/app_main.c
index e7bff0a..4f7a949 100644
--- a/main/app_main.c
+++ b/main/app_main.c
@@ -1,6 +1,8 @@
+#include "button.h"
 #include "display.h"
 #include "http_api.h"
 #include "jpeg_decoder.h"
+#include "local_screens.h"
 #include "mdns_service.h"
 #include "net_eth.h"
 #include "nvs_config.h"
@@ -41,10 +43,12 @@ void app_main(void)
     // Display is best-effort — a missing/miswired panel must not kill
     // networking + /state.
     if (display_init() == ESP_OK) {
+        local_screens_init();
+
         // Reconcile panel with current run-state:
-        //   UNCONFIGURED -> placeholder test pattern (M8 replaces with IP screen)
+        //   UNCONFIGURED -> IP screen (so operator can register from Scrypted)
         //   ASLEEP       -> backlight off (configured device booted asleep)
-        //   AWAKE        -> leave on (shouldn't happen on a fresh boot)
+        //   AWAKE        -> leave on (not reached on fresh boot)
         viewport_state_lock();
         viewport_run_state_t s = viewport_state_get()->state;
         viewport_state_unlock();
@@ -53,8 +57,8 @@ void app_main(void)
             display_sleep();
             ESP_LOGI(TAG, "display up — configured, backlight off (asleep)");
         } else {
-            display_test_pattern();
-            ESP_LOGI(TAG, "display up — test pattern (unconfigured)");
+            local_screens_show_ip();
+            ESP_LOGI(TAG, "display up — IP screen (unconfigured)");
         }
     } else {
         ESP_LOGW(TAG, "display init failed — continuing without panel");
@@ -72,5 +76,9 @@ void app_main(void)
         }
     }
 
-    // TODO M8: Local screens (IP, loading) + BOOT button
+    // BOOT button — short press = IP overlay, hold 5s = factory reset.
+    // GPIO is a guess until confirmed against the Waveshare schematic.
+    if (button_init() != ESP_OK) {
+        ESP_LOGW(TAG, "BOOT button init failed — overlay + factory reset disabled");
+    }
 }