Draft issue: Approachable Swift and MainActor isolation

[Copilot]

This PR drafts a tracking issue for adopting Swift 6.2's "Approachable Concurrency" features in PPPC Utility.

Current state: Swift 5.0 language mode, zero @MainActor annotations, no strict concurrency checking, 4 manual DispatchQueue.main.async calls, no Sendable conformances — despite 3 NSViewController subclasses and @objc dynamic model types accessed from UI via KVO/bindings.

No code changes — this PR contains only the issue writeup for review before filing. The issue covers:

• Audit of concurrency gaps — missing @MainActor on UI/model types, manual main-thread dispatch, no Sendable conformances
• Relevant Swift 6.2 proposals — SE-0461 (nonisolated(nonsending) default), SE-0466 (@MainActor inference), SE-0471 (relaxed Sendable), SE-0472 (task isolation inheritance)
• Incremental adoption plan — phased from enabling strict concurrency warnings → adding @MainActor → Sendable conformances → Swift 6.2 defaults
• Interaction notes — @objc dynamic / Cocoa Bindings interplay with @MainActor, existing NetworkAuthManager actor already well-structured

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• webcache.googleusercontent.com
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
• www.avanderlee.com
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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