Refactor ReviewMonitor streaming log rendering

[lynnswap]

Purpose

Refactor the ReviewMonitor log rendering path around typed monitor log documents and transient streaming animation behavior.

Changes

• Replace string/suffix-diff monitor rendering with ReviewMonitorLogDocument and ReviewMonitorLogChange append/replace/reload semantics.
• Keep monitor rendering incremental for appends and grouped replacements while avoiding stale change replay after metadata or hidden command-output updates.
• Add streaming word fade and reasoning line glow behavior while preserving non-animated progress/event-style log updates.
• Preserve find/search state across log updates and add regression coverage for grouped replacement, separator-prefixed appends, coalesced progress suffixes, and Reduce Motion behavior.

Testing

• git diff --check
• Xcode navigator issues: 0 errors
• swift test --build-system swiftbuild --no-parallel
• xcodebuild test -project Tools/ReviewMonitor/CodexReviewMonitor.xcodeproj -scheme CodexReviewMonitor -destination 'platform=macOS,arch=arm64' CODE_SIGNING_ALLOWED=NO CODE_SIGNING_REQUIRED=NO
• Codex review against main: no findings

UI Validation

• Streaming log animation and flicker behavior were validated locally during development; no screenshot artifact is attached.

[lynnswap]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 89f0937694

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[lynnswap]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Another round soon, please!

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".