fix: add Sign Out to account switcher popover

[mozyonee]

Description

Users looking for logout in the sidebar profile popover found only Guest Mode / account switch, so they felt stuck on the wrong account. Sign Out already existed in Settings; this adds the same action to the profile popover where people expect it.

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🤖 AI Prompt Used

Fix GitHub issue #361: can't logout / no disconnect in profile. Add Sign Out to the account switcher popover using the existing Settings sign-out path. Keep the change minimal.

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Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)

Related Issues

Fixes #361

Changes Made

• Add a Sign Out row to AccountSwitcherPopover (same prepareForSignOut() + signOut() path as Settings)
• While Guest Mode is active, only Guest Mode shows as selected (account rows stay unselected)
• Disable the accent focus ring on the popover’s list-style content
• Update profile accessibility hint and UI-test accessibility ID

Testing

• swift build
• swiftlint --strict on touched SwiftUI files
• Manual testing performed
• UI tested on macOS 26+

Manual checklist:

• Profile → popover shows Sign Out
• Sign Out returns to logged-out / login flow
• Guest Mode selected → account rows are not checkmarked
• Leaving Guest Mode / selecting an account restores normal selection
• Guest Mode row no longer shows a persistent accent focus outline on open

Checklist

• My code follows the project's style guidelines
• I have run swiftlint --strict && swiftformat .
• I have added tests that prove my fix/feature works
• New and existing unit tests pass locally
• I have updated documentation if needed
• I have checked for any performance implications
• My changes generate no new warnings

Screenshots

Additional Notes

Settings → General → Sign Out remains as a second entry point. Guest Mode still preserves the signed-in session (ADR-0024); only the popover selection UI treats Guest as the active choice.

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[mozyonee]

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