Add home layout customization and animation polish

[OWConnoi]

Summary

• Adds configurable Home slots for Now Playing, Calendar, Weather, and Empty across the left, center, and right positions.
• Adds animation intensity and Reduce Motion settings so users can reduce bounce and simplify transitions.
• Makes the compact island hover surface respond across the full island, addressing the minimal-layout hover gap.
• Documents the new appearance and Home layout settings.

Issue relevance

• Addresses Size and animation #50.
• Verified the issue maps to SuperIsland's current Home layout, compact hover behavior, and animation settings.
• Checked AppState, IslandContainerView, HomeScreenView, AppearanceSettingsView, and ModuleSettingsView before implementation.

Validation

• git diff --check
• Direct Swift typecheck passed with existing project warnings.
• xcodebuild -version passed with Xcode 26.5, build 17F42.
• xcodegen generate could not run because xcodegen is not installed in this environment.

Screenshots needed

• Settings -> Modules -> Home slot pickers.
• Settings -> Appearance animation intensity and Reduce Motion controls.
• Compact island hover and Home layout behavior.

Risk notes

• Reduced motion is an app setting in this PR; it does not automatically follow the system accessibility setting yet.
• Duplicate Home slot selections are ignored rather than shown twice.
• Manual hover testing on a notched Mac is recommended.

[shobhit99]

@OWConnoi can you resolve the conflicts here

[OWConnoi]

Resolved the README conflict against current main and pushed the branch. The PR is mergeable now; I also checked the PR diff for conflict markers and the requested restricted wording.