Add field notes page

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[Copilot]

Copilot review overview

🟡 Changes recommended

Three documentation accuracy nits remain unresolved.

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Review effort: Lite
Findings: 2

Open (2)

• Accurately describe Object.groupBy's null-prototype return value · New
• Qualify structuredClone as limited to cloneable values · New

What changed in this PR

Adds a Field notes collection with archive filtering, responsive styling, and updated frontend-devtools resources.

Changes:

• Adds Field notes content and collection metadata.
• Adds the archive page, tag filters, and responsive card styling.
• Updates frontend-devtools links and tag filtering.

File	Change
content/​field-notes/​vitest-test-each-table.md	Adds a Vitest field note.
content/​field-notes/​trace-equals-sum-of-eigenvalues.md	Adds a linear algebra field note.
content/​field-notes/​structured-clone.md	Adds a structuredClone field note. Nit (2 votes): Qualify that only structured-cloneable values are supported.
content/​field-notes/​singular-entities-in-ontologies.md	Adds an ontology field note.
content/​field-notes/​react-use-id.md	Adds a React useId field note.
content/​field-notes/​object-group-by.md	Adds an Object.groupBy field note. Nit (3 votes): Describe its null-prototype return value accurately.
content/​field-notes/​inert-attribute.md	Adds an inert attribute field note. Nit (1 vote): Clarify that inert does not visually hide elements.
content/​field-notes/​git-switch-vs-checkout.md	Adds a Git command comparison field note.
content/​field-notes/​field-notes.11tydata.js	Defines collection metadata and layout.
content/​field-notes/​feature-flags-decouple-deploy-release.md	Adds a feature-flags field note.
content/​field-notes/​elm-debug-tostring.md	Adds an Elm debugging field note.
content/​field-notes/​css-has-selector.md	Adds a CSS :has() field note.
content/​field-notes/​array-at-negative-index.md	Adds an array indexing field note.
content/​field-notes.njk	Adds the Field notes archive page and filters.
content/​blog/​web-frontend-devtools.md	Reorganizes frontend-devtools resources.
_includes/​styles/​field-notes.css	Styles the responsive note grid and cards.
_config/​filters.js	Excludes collection metadata from displayed tags.

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