fix(tui): preserve initial user message on new session hydration

[CreatorGhost]

Port of upstream anomalyco/opencode#36176.

Renders the submitted user message optimistically and merges it during session hydration, so the first message no longer vanishes from the timeline when a new session hydrates faster than the message projection lands.

Coexists cleanly with our paste-summary changes in prompt/index.tsx (verified: shouldSummarizePaste/countPasteLines intact post-merge).

Verified: bun test test/cli/cmd/tui/sync-live-hydration.test.tsx (6 pass, new hydration regression tests), bun test test/prompt/part.test.ts (5 pass), bun typecheck from packages/tui.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: dda8844f-8c01-4c46-8d61-037027f9f74d

📥 Commits

Reviewing files that changed from the base of the PR and between a377911 and ca4b546.

📒 Files selected for processing (3)

• packages/tui/src/component/prompt/index.tsx
• packages/tui/src/context/sync.tsx
• packages/tui/test/cli/cmd/tui/sync-live-hydration.test.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch optimistic-first-message

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