Simple Taunt Announce - reborn

# 1.1.1 — Detection sensitivity improvements (2025)

Focused patch addressing missed notifications for other tanks' taunts.
No breaking changes; fully backwards compatible with 1.1.0 saved settings.

### Bug fixes

- **`PLAYER_TARGET_CHANGED` reset removed.** The previous release reset the
  internal `playerWasTanking` flag every time the player changed target. In
  practice this caused the majority of missed "other tank taunted" notifications:
  switching targets mid-fight (e.g. targeting an add then returning to the boss)
  cleared the tracking state, so the next aggro-loss transition was invisible.

### Improvements

- **Dual-path threat detection.** `UNIT_THREAT_SITUATION_UPDATE` now handles
  two independent detection paths instead of one:

  - **Path A** (`unitID == 'player'`): fires when the player was the primary
    threat holder and is no longer — existing behaviour, now without the
    erroneous target-change reset.

  - **Path B** (`unitID == raid/party member`): fires when another group member
    *becomes* the primary threat holder on the player's current target. This
    path triggers independently of the player's own threat state, catching
    events that Path A misses due to timing or state drift.

  A 0.5-second flood guard prevents the two paths from double-announcing the
  same event.

- **`pcall` guard on `GetRaidTargetIndex()` return value.** `GetRaidTargetIndex`
  was returning a Midnight secret value (truthy proxy that crashes on table
  index). Wrapped in `pcall` — same pattern as `spellID` and `UnitGUID`.
  On failure the raid icon portion of the message is silently omitted; the
  rest of the announcement still fires.

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