fix(terminal): show full session history instead of last 5000 lines

[RonenMars]

Summary

The raw PTY/terminal view already receives the full session transcript from the server (via the WS terminal_replay message or the /api/sessions/{id}/output HTTP fallback), but publishLines() truncated it client-side to the last 5000 lines before ever rendering.
TerminalOutput's FlashList already supports scrolling through arbitrary line counts with jump-to-top/jump-to-bottom controls, so removing the truncation is enough to let users scroll through the entire loaded conversation.

Change

• hooks/useTerminalStream.ts: publishLines() no longer slices to terminalMaxLines; it publishes the full parsed scrollback.
• VirtualTerminal.MAX_ROWS (10,000 rows) remains as a memory ceiling for very long sessions.

Test plan

• Open a live session with a long PTY transcript and confirm scrolling up reveals content beyond the previous ~5000-line cutoff
• Confirm jump-to-top / jump-to-bottom buttons still work
• npx eslint hooks/useTerminalStream.ts passes