feat: add idle session visibility preference

[Apex-Studio-He]

Summary

• add a per-display-profile setting to show or hide idle completed sessions
• apply the preference to the expanded list, overview counts, and closed-island content
• make the persisted appearance preference model and its enum fields Codable
• document the persisted preference API and add a Codable round-trip regression test

Why

This separates the idle-session preference from the broad Codex session PR and addresses the remaining review request that persisted appearance preferences conform to Codable.

Validation

• swiftc -parse for the changed Swift source and test files
• plutil -lint for English, Simplified Chinese, and Traditional Chinese localization files
• git diff --check

The local Command Line Tools installation provides Swift 6.1 and no XCTest module, while this project requires Swift 6.2. A temporary compatibility build compiled the changed OpenIslandApp source module, but could not build the test target. Please use CI for the new AppModelSessionListTests regression tests.

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