refactor: migrate LayoutsContext to query module pattern

[adamhaeger]

Description

Migrates layout data fetching from the legacy LayoutsContext (context + provider pattern) to the nextsrc query module pattern at core/queries/layouts/.

What changed:

• New LayoutApi static class in core/api-client/layout.api.ts — replaces fetchLayouts/fetchLayoutsForInstance from useAppQueries
• New query module core/queries/layouts/ with layoutQueryDef(), typed query keys, and public hooks (useLayouts, useLayoutLookups, useLayoutLookupsLax, useHiddenLayoutsExpressions, useExpandedWidthLayouts)
• ~80 consumer files updated to import hooks from the new module instead of LayoutsContext
• LayoutsContext.tsx reduced from 190 lines to ~50 lines — now a thin loading gate (blocks rendering until layout query resolves, no context)
• Processing logic (processLayouts, removeDuplicateComponentIds, addLikertItemToLayout) moved into the query module's queryFn
• Layout lookups computed via module-level cache to avoid redundant makeLayoutLookups calls across consumers

Backward compatibility:

• LayoutsProvider remains in FormContext provider tree as a loading gate (validation layer requires layout data before rendering)
• layoutQueryDef accepts optional fetch functions parameter — hooks pass useAppQueries() functions preserving test mock infrastructure
• LayoutContextValue type alias preserved for e2e tests and devtools

Verification

• Related issues are connected (if applicable)
• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

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🔍 Lighthouse Report

URL	Performance	LCP	CLS	TBT	Link to Report
/ttd/component-library/	25/100 🟢	31387 ms 🟢	0 🟢	7471 ms 🔴	Report