dangernoodle-io / TaipanMiner / 26200680578

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feat(stats): track timestamps for block-found and best-diff events (#416)

Expose wall-clock timestamps for the four "when did that happen?" events
that the headline tiles and per-pool cards already surface:
  - session_best_diff_ts, session_last_block_ts (RAM, reset on boot)
  - per-slot best_diff_ts, last_block_ts (NVS-persisted)
  - lifetime_last_block_ts (NVS-persisted, survives LRU slot eviction)

Firmware records time(NULL) at each event, sanitized to 0 if SNTP hasn't
synced yet (sentinel: ts < 2023). NVS adds four new u32 keys per slot
(bdt_hi/lo + lbt_hi/lo) plus ps_lblk_hi/lo for the device-lifetime mark.

The block.found bb_event payload gains a "timestamp" field so the dismiss
banner can show when the block was actually found rather than when the
SSE message arrived (resilient to replays).

Hero tiles get tooltip-style annotations ("session: 3h ago · lifetime:
2d ago"), PoolStatsCard surfaces per-pool block + best-diff times, and
BlockFoundBanner shows the find time inline.

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