SymbolChat L'ura memory game Hm

## v3.0.0

### ⚠ Breaking Changes
- The symbol button bar has been removed. Sequences are now composed exclusively via macros bound to keys.

### New Features
- **First-time setup popup** — on first login, a dialog asks whether you are a Raid Leader. Answering yes automatically creates all 5 symbol macros.
- **Simplified macros** — macros are now named after the symbol directly (`Circle`, `T`, `X`, `Diamond`, `Triangle`) instead of `SC-Circle`, `SC-T`, etc.

### Bug Fixes
- Fixed a Lua error ("attempt to perform arithmetic on a secret string value") that occurred when a chat message arrived during combat. The chat parser now runs in a fully isolated frame to prevent WoW taint from blocking message content.

### Removed
- Button bar UI (symbol buttons, sequence slots, SEND button)
- `/sc show` and `/sc hide` commands (no bar to toggle)