Reduce idle energy usage with central module refresh scheduling

[OWConnoi]

Summary:

• Adds a central refresh scheduler for built-in modules and extensions.
• Pauses non-essential work when modules are hidden, disabled, or the island is collapsed.
• Adds Normal, Smart, and Low Power controls plus diagnostics for active refresh jobs.
• Addresses energy-related reports in The energy consumption performance of this software on Macbook air is very poor. #67, Poor power management #68, and Using Significant Energy #69.

Validation:

• git diff --check passed.
• Direct Swift typecheck of app sources passed with the package-backed analytics source excluded because package resolution depends on generated project setup.
• xcodebuild -version reported Xcode 26.5.
• xcodegen generate could not run because xcodegen is unavailable locally.
• Full xcodebuild could not run because the project file is generated and is not present without XcodeGen.

Screenshots needed:

• Settings -> General -> Power section.
• Settings -> Advanced -> Energy Diagnostics section with scheduled jobs visible.

Risk notes:

• Refresh cadence changes can affect perceived freshness for notifications, extensions, and Now Playing fallback updates.
• Calendar still has existing Swift concurrency warnings around EventKit values used off the main queue.
• Weather still has existing macOS 26 deprecation warnings for reverse geocoding APIs.
• Manual idle-energy verification in Activity Monitor or Instruments is still needed on a real Mac session.

[shobhit99]

@OWConnoi this and other ones too. all of em got conflicts after the last merge

[OWConnoi]

.