refactor(app): split components/ into layouts/ and feature sections/

[MarkusNeusinger]

Summary

Part 7 of the frontend modernization roadmap. Pure git mv + import-specifier rewrite — zero logic changes.

• src/layouts/: RootLayout, Layout (AppDataProvider), BareLayout, NavBar, Footer, MastheadRule
• src/sections/landing/: HeroSection, NumbersStrip, PaletteStrip, LibrariesSection, PlotOfTheDay, PlotOfTheDayTerminal, TypewriterText, ScienceNote
• src/sections/spec-detail/: SpecDetailView, SpecTabs, SpecOverview, RelatedSpecs, CodeShowcase, LibraryPills (used only by SpecPage — placed here instead of plots-gallery as originally sketched)
• src/sections/plots-gallery/: FilterBar, ImagesGrid, ImageCard, ToolbarActions
• src/sections/libraries/: LibraryCard
• src/components/ keeps shared primitives only: LoaderSpinner, SectionHeader, ErrorBoundary, RouteErrorBoundary, CodeHighlighter, ThemeToggle, FeedbackWidget
• Barrel index.ts per folder; hooks/ barrel completed (+3) and utils/ barrel completed (+4)
• Tests moved alongside their components; layouts/ and sections/ added to coverage

Note: ScienceNote, CodeShowcase, BareLayout, PlotOfTheDay (non-terminal) and PaletteStrip are currently dead code (only self/test references) — moved as-is rather than deleted; removal is proposed separately.

Verification

yarn lint ✓ · yarn fm:check ✓ · yarn type-check ✓ · yarn test 552/552 ✓ · yarn build ✓

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[Copilot]

Pull request overview

Refactors the frontend folder structure by moving UI code from src/components/ into src/layouts/ (app chrome/providers) and src/sections/ (page feature blocks), while updating imports, barrels, and Vitest coverage globs accordingly.

Changes:

• Introduces src/layouts/ and src/sections/** structure with per-folder index.ts barrels.
• Rewrites import specifiers across pages/routes/tests to point at the new locations.
• Extends Vitest coverage include globs to track layouts/ and sections/.

Reviewed changes

Copilot reviewed 41 out of 60 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
app/vitest.config.ts	Adds coverage include globs for src/layouts/** and src/sections/**.
app/src/utils/index.ts	Completes utils/ barrel exports.
app/src/sections/spec-detail/SpecTabs.tsx	Spec detail tabs component moved under sections/spec-detail.
app/src/sections/spec-detail/SpecTabs.test.tsx	Updates SpecTabs test import path.
app/src/sections/spec-detail/SpecOverview.tsx	Spec implementations overview grid moved under sections/spec-detail.
app/src/sections/spec-detail/SpecOverview.test.tsx	Updates SpecOverview test import path.
app/src/sections/spec-detail/SpecDetailView.tsx	Single-implementation detail view moved under sections/spec-detail.
app/src/sections/spec-detail/SpecDetailView.test.tsx	Updates SpecDetailView test import path.
app/src/sections/spec-detail/RelatedSpecs.tsx	Similar/related specs section moved under sections/spec-detail.
app/src/sections/spec-detail/RelatedSpecs.test.tsx	Updates RelatedSpecs test import path.
app/src/sections/spec-detail/LibraryPills.tsx	Library selector “pills” moved under sections/spec-detail.
app/src/sections/spec-detail/LibraryPills.test.tsx	Updates LibraryPills test import path.
app/src/sections/spec-detail/index.ts	Adds sections/spec-detail barrel.
app/src/sections/spec-detail/CodeShowcase.tsx	Moves CodeShowcase section under sections/spec-detail.
app/src/sections/plots-gallery/ToolbarActions.tsx	Extracts plots-gallery toolbar actions under sections/plots-gallery.
app/src/sections/plots-gallery/ToolbarActions.test.tsx	Updates ToolbarActions test import path.
app/src/sections/plots-gallery/index.ts	Adds sections/plots-gallery barrel.
app/src/sections/plots-gallery/ImagesGrid.tsx	Moves ImagesGrid under sections/plots-gallery.
app/src/sections/plots-gallery/ImagesGrid.test.tsx	Updates ImagesGrid test import path + mocks.
app/src/sections/plots-gallery/ImageCard.tsx	Moves ImageCard under sections/plots-gallery.
app/src/sections/plots-gallery/ImageCard.test.tsx	Updates ImageCard test import path.
app/src/sections/plots-gallery/FilterBar.tsx	Moves FilterBar under sections/plots-gallery and rewires ToolbarActions import.
app/src/sections/plots-gallery/FilterBar.test.tsx	Updates FilterBar test import path.
app/src/sections/libraries/LibraryCard.tsx	Moves LibraryCard under sections/libraries.
app/src/sections/libraries/LibraryCard.test.tsx	Updates LibraryCard test import path.
app/src/sections/libraries/index.ts	Adds sections/libraries barrel.
app/src/sections/landing/TypewriterText.tsx	Moves TypewriterText under sections/landing.
app/src/sections/landing/ScienceNote.tsx	Updates ScienceNote imports to new landing section locations.
app/src/sections/landing/PlotOfTheDayTerminal.tsx	Moves PlotOfTheDayTerminal under sections/landing.
app/src/sections/landing/PlotOfTheDayTerminal.test.tsx	Updates PlotOfTheDayTerminal test import path.
app/src/sections/landing/PlotOfTheDay.tsx	Moves PlotOfTheDay under sections/landing.
app/src/sections/landing/PlotOfTheDay.test.tsx	Updates PlotOfTheDay test import path.
app/src/sections/landing/PaletteStrip.tsx	Moves PaletteStrip under sections/landing.
app/src/sections/landing/NumbersStrip.tsx	Moves NumbersStrip under sections/landing.
app/src/sections/landing/LibrariesSection.tsx	Updates LibrariesSection to use sections/libraries/LibraryCard.
app/src/sections/landing/index.ts	Adds sections/landing barrel.
app/src/sections/landing/HeroSection.tsx	Updates HeroSection imports to landing section locations.
app/src/sections/landing/HeroSection.test.tsx	Updates HeroSection test mocks/imports for new paths.
app/src/routes/index.tsx	Switches router wiring to layouts/Layout and layouts/RootLayout.
app/src/pages/SpecPage.tsx	Repoints SpecPage to sections/spec-detail/* (including lazy imports).
app/src/pages/SpecPage.test.tsx	Updates SpecPage lazy-component mocks to new paths.
app/src/pages/PlotsPage.tsx	Repoints PlotsPage to sections/plots-gallery/*.
app/src/pages/PlotsPage.test.tsx	Updates PlotsPage mocks to new paths (including Footer).
app/src/pages/LibrariesPage.tsx	Repoints LibrariesPage to sections/libraries/LibraryCard.
app/src/pages/LandingPage.tsx	Repoints LandingPage to sections/landing/*.
app/src/pages/LandingPage.test.tsx	Updates LandingPage mocks to new paths.
app/src/layouts/RootLayout.tsx	Moves RootLayout under layouts/ and updates internal imports.
app/src/layouts/RootLayout.test.tsx	Updates RootLayout test mocks/imports to new paths.
app/src/layouts/NavBar.tsx	Moves NavBar under layouts/.
app/src/layouts/NavBar.test.tsx	Updates NavBar test import path.
app/src/layouts/MastheadRule.tsx	Moves MastheadRule under layouts/.
app/src/layouts/MastheadRule.test.tsx	Updates MastheadRule test import path.
app/src/layouts/Layout.tsx	Moves AppDataProvider (Layout) under layouts/.
app/src/layouts/Layout.test.tsx	Updates Layout test import path.
app/src/layouts/index.ts	Adds layouts/ barrel.
app/src/layouts/Footer.tsx	Moves Footer under layouts/.
app/src/layouts/Footer.test.tsx	Updates Footer test import path.
app/src/layouts/BareLayout.tsx	Adds BareLayout under layouts/.
app/src/hooks/index.ts	Completes hooks/ barrel exports.
app/src/components/index.ts	Keeps components/ as shared primitives barrel.