refactor: Extract terminal rendering logic to useTerminalRenderer composable
- Create useTerminalRenderer.ts with all xterm.js logic - Support custom theme, fontSize, fontFamily options - Add handleReplay() for proper visibility handling - Add getBufferContent() for copying terminal content - Refactor FloatingTerminal.vue to use composable - Refactor TerminalPage.vue to use composable - Server: Add request-replay message type for on-demand replay - Server: Remove auto-replay on connect (client requests when ready) - Fix xterm.js rendering issues with hidden containers (v-show)
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