feat: implement Spawn view

[2witstudios]

Summary

• Adds SpawnView.swift — SwiftUI form for spawning worktrees with agents from the iOS app
• Includes name field, multi-line prompt editor, agent type picker (claude/codex/opencode), count stepper (1-10), base branch picker, and quick prompt templates section
• Form validation ensures name is required and either prompt or template must be provided
• Loading state disables controls during spawn, form clears on success, and navigates to the new worktree detail view on completion

Dependencies

• Implement iOS data models #77 (iOS data models — AgentVariant, WorktreeEntry)
• Implement REST client (PPGClient) #78 (PPGClient — spawn() API)
• Implement iOS state management (AppState + ManifestStore) #82 (AppState + ManifestStore)
• Dashboard views epic (WorktreeDetailView)

Closes #85

Test plan

• Verify form renders with all sections (name, agent, prompt, templates, base branch)
• Verify Spawn button is disabled when name is empty
• Verify Spawn button is enabled when name + prompt are filled
• Verify Spawn button is enabled when name + template are selected (no prompt)
• Verify agent type picker shows claude/codex/opencode variants
• Verify count stepper bounds (1-10)
• Verify templates section is hidden when no templates available
• Verify template toggle selection (tap to select, tap again to deselect)
• Verify loading spinner replaces Spawn button text during API call
• Verify form clears on successful spawn
• Verify navigation to WorktreeDetailView after spawn
• Verify error message displays on spawn failure

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📥 Commits

Reviewing files that changed from the base of the PR and between 34deb69 and 52e61fd.

📒 Files selected for processing (2)

• ios/PPGMobile/PPGMobile/Views/Spawn/SpawnView.swift
• src/commands/spawn.test.ts

✨ 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-85-spawn-view

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