[codex] Update dashboard for unified stores

[ScriptedAlchemy]

Summary

• updates dashboard APIs and UI for unified graph, memory, LCM, and savings stores
• refreshes dashboard smoke coverage and embedded assets
• keeps this PR stacked on the backend storage/session branch

Validation

• cargo fmt --all -- --check
• cargo check --workspace on each stack branch
• cargo test --workspace on the top of the stack

[changeset-bot]

⚠️ No Changeset found

Latest commit: 67d5e2f

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[chatgpt-codex-connector]

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