feat(web): reorganize sidebar layout - settings to nav, toggles reordered

[arielshad]

Summary

• Settings moved to main nav: The Settings link has been relocated from the sidebar footer to the sidebar header navigation, making it a first-class nav item alongside Home, Tools, and Skills
• Toggle order changed: In the sidebar footer, the theme toggle now appears first (left) and the sound toggle appears second (right), reversing the previous order
• Collapsed sidebar behavior: When the sidebar is collapsed, only the theme toggle is visible in the footer; the sound toggle is hidden to save space
• Spec files added: Feature specification 076 for sidebar layout reorganization

Test plan

• Build compiles without errors (pnpm build)
• All 4746 unit tests pass (pnpm test:unit)
• Lint passes with zero warnings (pnpm lint:fix)
• Spec YAML backward compatibility test passes
• Visual verification: Settings appears in sidebar nav header
• Visual verification: Theme toggle is first (left), sound toggle is second (right) in footer
• Visual verification: Collapsed sidebar shows only theme toggle in footer

🤖 Generated with Claude Code

[github-actions]

Dev Release Published

Artifact	Version	Install
npm	1.147.0-pr461.08148ed	npm install -g @shepai/cli@1.147.0-pr461.08148ed

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_{Published from commit 914527a | View CI}