Info screen: full /config + /state dump, replaces identity screen

Previously the 4-line "identity" screen showed only viewport name, mDNS
host, IP, and state. Expanded to 15 lines covering the full GET /config
+ GET /state output (name, host, ip, state, configured, scrypted,
orientation, brightness, idle, fw, uptime, frames, errs, free heap,
free PSRAM), label/value pairs left-aligned with auto-scaled font.

Renames "identity" → "info" throughout — symbol, log messages,
README/TESTING references.

Also:
- Move the info-screen render's big locals (~1.6 KiB: lines[16][80] +
  scrypt[256] + vp_name[64]) to BSS. The touch task's 3 KiB stack
  was overflowing on every long-press, leaving whatever frame was
  previously on the panel — gave the appearance of a "blue screen"
  after the M5 test pattern.
- Drop the ≥5 s touch factory-reset gesture and remove all stale
  references to it in docs and comments. NVS wipe is now a USB-side
  `idf.py erase-flash` operation only.
- M5 follow-up TODO in jpeg_decoder.c: solid green renders ~black and
  solid blue renders green; not a byte-order issue (BGR setting turns
  red into blue). Tracked as a known M5 gap.

1 files changed, 5 insertions, 0 deletions

diff --git a/main/jpeg_decoder.c b/main/jpeg_decoder.c
index b34612d..259af65 100644
--- a/main/jpeg_decoder.c
+++ b/main/jpeg_decoder.c
@@ -71,6 +71,11 @@ esp_err_t jpeg_decoder_decode(size_t   jpeg_len,
     jpeg_decode_cfg_t dec_cfg = {
         .output_format = JPEG_DECODE_OUT_FORMAT_RGB565,
         .rgb_order     = JPEG_DEC_RGB_ELEMENT_ORDER_RGB,
+        // TODO: known color bug on M5 — solid red renders correctly but solid
+        // green renders ~black and solid blue renders green. Likely a JPEG
+        // colorspace / channel-permutation issue, not a byte-order one
+        // (swapping to BGR turns red into blue, confirming RGB is the right
+        // element ordering). Needs follow-up.
         .conv_std      = JPEG_YUV_RGB_CONV_STD_BT601,
     };