dangernoodle-io / breadboard / 24793021539

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feat(bb_nv): add u16 accessors; erase-on-mismatch setters; fallback-on-mismatch getters (#70)

- new bb_nv_{set,get}_u16 symmetric with u8/u32
- all set_uN now erase the key and retry if nvs_set_uN returns
  ESP_ERR_NVS_TYPE_MISMATCH, so cross-version width changes are
  transparent (no silent first-save failure)
- all get_uN now treat ESP_ERR_NVS_TYPE_MISMATCH like NOT_FOUND:
  populate fallback and return BB_OK with a WARN log, so upgrades
  that change a key's width don't panic ESP_ERROR_CHECK callers

motivation: TaipanMiner's pool_port migrated between u16 and u32 across
firmware versions; the previous strict behavior caused "port cleared
after upgrade" and "first save doesn't stick" bugs.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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