feat: merge display-fix — touch driver, keyboard, WiFi setup UI

Squash-merge of feature/display-fix (27 commits):
- AXS15231B touch driver with coordinate parsing (touch.c/h)
- On-screen keyboard with layout/hit detection (keyboard.c/h)
- WiFi setup state machine + config_add_wifi (wifi_setup.c/h)
- Web-based WiFi setup via captive portal
- Display rotation fix (stride=480), color fixes, DMA byte-swap
- WiFi QR code on BOOT and ERROR screens
- ERROR state transition after WiFi retries exhausted
- Unit tests: test_touch, test_keyboard, test_wifi_setup
- Integration test: wifi_setup.mjs
- E2E test: wifi-setup.spec.mjs
- Per-board hardware locks for flash targets

Conflicts resolved: took master for config/cvm/api/main (more current),
took display-fix for display/axs15231b (newer fixes).

1 files changed, 8 insertions, 2 deletions

diff --git a/main/display.h b/main/display.h
index 407521b..ecb76b6 100644
--- a/main/display.h
+++ b/main/display.h
@@ -9,7 +9,8 @@ typedef enum {
     DISPLAY_BOOT,
     DISPLAY_READY,
     DISPLAY_PAYMENT_RECEIVED,
-    DISPLAY_ERROR
+    DISPLAY_ERROR,
+    DISPLAY_SETUP_PENDING
 } display_state_t;
 
 typedef enum {
@@ -20,7 +21,12 @@ typedef enum {
 esp_err_t display_init(void);
 void display_set_state(display_state_t state);
 void display_update(const char *ap_ssid, int active_clients,
-                    uint64_t wallet_balance, const char *portal_url);
+                    uint64_t wallet_balance, const char *portal_url,
+                    const char *mint_url, int price_per_step,
+                    const char *wifi_status);
+void display_notify_payment(int amount_sats, int64_t allotment_ms);
+void display_notify_wifi_connected(const char *ip);
+void display_notify_wifi_disconnected(void);
 void display_render_text(int x, int y, const char *text, uint16_t fg, uint16_t bg, int scale);
 void display_render_qr(const char *text);