fix: preserve lazy tile height

[fredrikblau]

Description

Lazy tile placeholders are shorter than hydrated tiles by the height of the tile content's line box. Revealing a tile therefore expands its grid row and shifts the items below it while scrolling.

Give the placeholder a minimum height based on the configured tile width, the 16:9 preview ratio, and the 44px content area used by hydrated tiles.

Related Issue

• Fixes Tiles view: lazy placeholder is 4px shorter than a hydrated tile, causing layout shift #3170

How Has This Been Tested?

• test environment: Node.js 26.7.0, pnpm 11.24.0
• test case 1: pnpm test:unit --run packages/web-pkg/tests/unit/components/FilesList/ResourceTile.spec.ts
• test case 2: pnpm check:types
• test case 3: pnpm lint
• test case 4: pnpm format:check

Types of changes

• Bugfix
• Enhancement (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt (improving code quality without changing functionality)
• Tests (adding or updating tests)
• Documentation (updates to the documentation, readme, or changelog)
• Maintenance (updates to the build process or auxiliary tools and libraries)

[fredrikblau]

Updated as suggested: removed the calculated shimmer minimum height and changed the lazy tile bottom placeholder from h-6 to h-7.

Validated with the ResourceTile and ResourceTiles test suites (26 tests passed), formatting, ESLint, and diff checks.

[JammingBen]

Thanks!