Audit and close remaining accessibility identifier coverage

[jbcrane13]

Evidence

The modern Apple accessibility audit reports 115 iOS and 52 macOS interactive-element candidates outside the v2.2.1 recovery/dashboard paths. The detector includes false positives for custom controls and distant modifiers, so each candidate needs source validation before editing.

Scope

• Validate every reported interactive element and screen container.
• Add stable identifiers to genuine gaps using the project naming convention.
• Route identifiers through shared custom controls such as GlassButton and ToolRunButton.
• Add a CI regression check that evaluates changed SwiftUI files.
• Complete a manual VoiceOver and keyboard-navigation pass on both apps.

Acceptance

• No confirmed interactive control lacks a stable accessibility identifier.
• The audit baseline is documented and cannot regress.
• iOS VoiceOver and macOS VoiceOver/keyboard navigation smoke tests pass.

Follow-up identified while implementing #262.