Identity screen: name + hostname + IP + state, auto-scaled

local_screens_show_ip() now renders four lines instead of two —
all the device's runtime identity at once:

  line 1: viewport name      ("mudroom"  / "viewport" if unconfigured)
  line 2: mDNS hostname      ("viewport-mudroom.local" / "viewport.local")
  line 3: IP                 ("192.168.1.42" / "no network")
  line 4: state              ("awake" / "asleep" / "unconfigured")

Same screen is shown on first boot, after factory reset, and as a
15s BOOT short-press overlay — operator always has the device's full
identity one button-press away (find it on the LAN, confirm name +
configuration without curling).

Font scale is auto-picked: the largest integer scale (1×–6×) where
the longest line fits within 90% of width AND all four lines plus
inter-line spacing fit within 90% of height. Works for both portrait
(480×800) and landscape (800×480) without separate code paths.

Font expanded to cover the new strings:
- All lowercase a–z (added b, f, h, j, k, m, q, s, u, x, y, z).
- Punctuation: dash, slash (digits, period, colon already covered).

Fallback policy unchanged: unsupported chars render as blank, which
keeps the table tight and the failure mode visible rather than
crashing.

README "Local rendering" + TESTING.md M8 updated to describe the
four-line identity layout and show both the unconfigured-boot and
configured-overlay example outputs.

Build verified clean against ESP-IDF 5.4 (binary ~873 KB, +1.6 KB
for the expanded font).

1 files changed, 7 insertions, 4 deletions

diff --git a/main/local_screens.h b/main/local_screens.h
index 20b2b36..ffe9a3d 100644
--- a/main/local_screens.h
+++ b/main/local_screens.h
@@ -7,10 +7,13 @@
 // bitmap font.
 esp_err_t local_screens_init(void);
 
-// Render the unconfigured / identify screen — two centered lines:
-//   "viewport.local"
-//   <current IP>
-// Shown on first boot, after factory reset, and as a BOOT-button overlay.
+// Render the identity / "who am I" screen — four centered lines:
+//   <viewport name>            ("viewport" if unconfigured)
+//   viewport-<name>.local       (mDNS hostname)
+//   <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.
 esp_err_t local_screens_show_ip(void);
 
 // Render the loading screen — centered "Loading…" — shown on every wake