dangernoodle-io / breadboard / 27358074672

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feat(bb_ntp): manual timezone — POSIX-TZ setter + bb_nv persistence (#389)

NTP gives only UTC; let breadboard own a timezone so consumers (TM/CYD,
snugfeather) render local civil time via libc localtime(). API only — no
breadboard route; consumers own their settings UI.

- bb_nv: typed `timezone` POSIX-TZ field (bb_nv_config_timezone /
  _set_timezone), NVS-persisted, <=64 chars, NULL/empty clears.
- bb_ntp_set_timezone(posix_tz): persist via bb_nv + setenv("TZ")/tzset()
  immediately. bb_ntp_apply_saved_timezone() applies the stored TZ at
  boot. UTC default when unset.

host-tested end-to-end including DST: with EST5EDT,M3.2.0,M11.1.0 a
winter UTC time renders EST and a summer one EDT.

geo-IP auto-detect is split to B1-268 (opt-in convenience; manual
override always wins).

verified: 1723 host tests pass; coverage 100%; smoke green on esp32,
esp32c3, esp32-p4, tdongle-s3.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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