feat: implement Terminal views

[2witstudios]

Summary

• TerminalView.swift — subscribes to WebSocket terminal:output events for a specific agent, fetches initial logs via REST (GET /api/agents/:id/logs), auto-scrolls on new output, monospace green-on-black rendering, kill button in toolbar with confirmation dialog
• TerminalInputBar.swift — monospaced text input field + send button, sends input via WebSocket terminal:input command, submits on return key
• Chains onto existing wsManager.onMessage handler to avoid overwriting AppState's manifest/status handling

Dependencies

• WebSocketManager (Implement WebSocket manager #79) — subscribeTerminal, unsubscribeTerminal, sendTerminalInput
• PPGClient (Implement REST client (PPGClient) #78) — fetchLogs(agentId:lines:)
• AppState (Implement iOS state management (AppState + ManifestStore) #82) — killAgent, client, wsManager, manifest

Test plan

• Navigate from WorktreeDetailView agent row to TerminalView
• Verify initial logs load via REST on appear
• Verify live WebSocket output appends in real-time
• Verify auto-scroll to bottom on new output
• Send input via text field and confirm it reaches the agent pane
• Kill agent via toolbar button and confirm status updates
• Verify unsubscribe fires on back navigation

Closes #84

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📥 Commits

Reviewing files that changed from the base of the PR and between 34deb69 and 72b1224.

📒 Files selected for processing (2)

• ios/PPGMobile/PPGMobile/Views/Terminal/TerminalInputBar.swift
• ios/PPGMobile/PPGMobile/Views/Terminal/TerminalView.swift

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ppg/issue-84-terminal-views

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