Show compact menu bar temperature only when Warm or Hot

[nsd97]

What does this PR do?

Proposes a calmer menu bar: keep the template fan when thermally Good, and only show a compact monochrome temperature (e.g. 78°) beside it when Warm or Hot — same thresholds as the popover header.

Closes #9.

Context

• Issue: Proposal: Show menu bar temperature only when Warm or Hot #9
• Stack: standalone (no dependency on other open PRs)
• Out of scope: colored menu bar icons, Ultra / helper changes, Swift Testing harness

What changed

• ThermalStatus — shared Good / Warm (≥75°C) / Hot (≥90°C) vocabulary
• Popover header uses ThermalStatus so thresholds cannot drift from the bar
• Settings → Display → Show Temp in Menu Bar (default on)
• StatusBarController updates title only when mode/text changes

Review guide

Start at: ChillMac/Fan/ThermalStatus.swift → ChillMac/App/StatusBarController.swift (updateStatusItem) → ChillMac/Views/SettingsView.swift (Display row)

How to test

1. xcodegen generate && xcodebuild -project ChillMac.xcodeproj -scheme ChillMac build
2. Run the app → when peak temp is under 75°C, menu bar is fan-only
3. Under load (≥75°C), fan shows NN° (respects Fahrenheit setting); ≥90°C still monochrome digits
4. Settings → Display → turn Show Temp in Menu Bar off → fan-only always

Checklist

• Builds without errors (xcodegen generate && xcodebuild -scheme ChillMac build)
• Unit tests pass — N/A on current main (no test target yet; logic is small and shared via ThermalStatus)
• Tested manually in the app

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