NE Stats

Fixes & behavior

• Stats panel stays usable in combat and in M+ when primary APIs return secret numbers: last successful value and rating are cached for display when live reads fail.
• Safe read chain: primary def.value / def.rating, then optional valueReaders (e.g. GetCombatRatingBonus for the right CR_* IDs; for STR/AGI/INT, UnitStat via base + posBuff - negBuff), all behind pcall and issecretvalue checks.
• Optional ratingReaders for the same pattern on rating.
• Layout: measuredStats built with table.insert so column layout stays correct when some lines are skipped.
• In combat, a light C_Timer tick (~0.35s) calls RefreshStats while InCombatLockdown(); starts on PLAYER_REGEN_DISABLED and on PLAYER_ENTERING_WORLD if already in combat; stops on PLAYER_REGEN_ENABLED.
• PLAYER_REGEN_ENABLED still triggers RefreshStats() (and clears the combat ticker).