feat(controller): add tweak preview session (#658)

[plastikfan]

Summary by CodeRabbit

• New Features

  • Added support for disposable preview sessions that can be marked complete and report basic completion status.
  • Added a new theme update message to carry theme changes through the app.

• Tests

  • Added coverage for preview session behavior, including completion tracking and default timing values.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ce7db6cd-6610-4d67-8bc5-c76d6a63a56f

📥 Commits

Reviewing files that changed from the base of the PR and between 1a36879 and dd97c76.

📒 Files selected for processing (3)

• src/app/controller/preview-session.go
• src/app/controller/preview-session_test.go
• src/prism/contract/messages.go

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📝 Walkthrough

Walkthrough

Adds a PreviewSession type in the controller package implementing core.Session, with atomic completion tracking and stubbed timing methods, plus a Ginkgo/Gomega test suite. Also adds a new ThemeUpdateMsg struct to the prism contract package.

Changes

Preview Session Implementation

Layer / File(s)	Summary
PreviewSession core type src/app/controller/preview-session.go	Adds PreviewSession with atomic completion flag, NewPreviewSession constructor, IsComplete/MarkComplete methods, stubbed StartedAt/Elapsed, and a compile-time core.Session interface check.
PreviewSession tests src/app/controller/preview-session_test.go	Adds Ginkgo/Gomega tests verifying initial state, idempotent MarkComplete, zero-value timing methods, and interface satisfaction of core.Session.

Theme Update Message

Layer / File(s)	Summary
ThemeUpdateMsg struct src/prism/contract/messages.go	Adds new exported ThemeUpdateMsg struct carrying a Theme field.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Estimated code review effort: 1 (Trivial) | ~5 minutes

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/tweak-preview-session-and-view-isolation-audit

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