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).

0 files changed, 0 insertions, 0 deletions