Stores up to 500 combat events in a rolling deque alongside the existing
floating combat text. Events are populated via the existing addCombatText()
call site, resolving attacker/target names from the entity manager and
player name cache at event time.
- CombatLogEntry struct in spell_defines.hpp (type, amount, spellId,
isPlayerSource, timestamp, sourceName, targetName)
- getCombatLog() / clearCombatLog() accessors on GameHandler
- renderCombatLog() in GameScreen: scrollable two-column table (Time +
Event), color-coded by event category, with Damage/Healing/Misc filter
checkboxes, auto-scroll toggle, and Clear button
- /combatlog (/cl) chat command toggles the window
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