feat(lib): Change PopperJs to Floating UI

[louismaximepiton]

Types of change

• Non-breaking change
• Breaking change (fix or feature that would change existing functionality and usage)

Related issues

NA

Context & Motivation

Update PopperJs to Floating UI for a newer version of the lib.

Description

Based on twbs/bootstrap#41941, update our JS and documentation to use Floating UI.

Checklists

• I have read the contributing guidelines
• My change follows the developer guide
• My change pass all tests
• My change is compatible with a responsive display
• I have added tests (Javascript unit test or visual) to cover my changes
• My change introduces changes to the documentation that I have updated accordingly
  • Title and DOM structure is correct
  • Links have been updated (title changes impact links)
  • CSS for the documentation
• I have checked all states and combinations of the component with my change
• I have checked all the impacts for the other components and core behavior (grid, reboot, utilities)

Checklist (for Core Team only)

• The changes need to be in the migration guide
• The changes are well displayed in Storybook (be careful if example order has changed for DSM)
• The changes are compatible with RTL
• Manually test browser compatibility with BrowserStack (Chrome 120, Firefox 121, Edge 120, Safari 15.6, iOS Safari, Chrome & Firefox on Android)

Progression (for Core Team only)

• Code review
• Design review
• A11y review
• Commit on ouds/main following conventional commit

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[Copilot]

Pull request overview

This PR migrates OUDS Web’s positioning dependency from Popper.js to Floating UI, updating the library code, build tooling, documentation, and tests to match the new dependency and attribute conventions.

Changes:

• Replace Popper.js usage with Floating UI in core components (Tooltip/Dropdown) and introduce a new Floating UI utility module.
• Update documentation, CDN configuration keys, and migration guides to reference Floating UI instead of Popper.js.
• Adapt unit/visual tests and build scripts (Rollup externals, SRI generation, bundle size thresholds) for Floating UI.

Reviewed changes

Copilot reviewed 30 out of 31 changed files in this pull request and generated 14 comments.

Show a summary per file

File	Description
site/src/libs/config.ts	Renames CDN config schema fields from popper* to floating_ui*.
site/src/content/docs/getting-started/migration.mdx	Adds migration note about switching from Popper.js to Floating UI.
site/src/content/docs/getting-started/migration-from-boosted.mdx	Adds migration note about switching from Popper.js to Floating UI.
site/src/content/docs/getting-started/javascript.mdx	Updates ESM/importmap guidance and dependency wording to Floating UI.
site/src/content/docs/getting-started/introduction.mdx	Updates quick-start instructions and CDN snippet to Floating UI keys.
site/src/content/docs/getting-started/download.mdx	Updates download/CDN notes to Floating UI.
site/src/content/docs/getting-started/contents.mdx	Updates bundled-dependency table/text from Popper to Floating UI.
site/src/content/callouts/warning-data-bs-title-vs-title.md	Updates callout wording to Floating UI.
site/src/components/home/GetStarted.astro	Updates homepage copy to mention Floating UI.
scss/_tooltip.scss	Switches tooltip placement selectors from data-popper-placement to data-bs-placement; removes a deprecation include.
scss/_popover.scss	Switches popover placement selectors from data-popper-placement to data-bs-placement.
scss/_dropdown.scss	Removes Popper-specific dropdown positioning/responsive SCSS blocks.
README.md	Updates README wording from Popper to Floating UI.
packages/sosh/config.yml	Replaces popper CDN entries with floating_ui equivalents.
packages/orange/config.yml	Replaces popper CDN entries with floating_ui equivalents.
packages/orange-compact/config.yml	Replaces popper CDN entries with floating_ui equivalents.
package.json	Swaps @popperjs/core peer/dev dependency to @floating-ui/dom; updates shim deps.
package-lock.json	Removes @popperjs/core lock entry; adds @floating-ui/* packages.
js/tests/visual/dropdown.html	Updates visual test label text.
js/tests/unit/util/floating-ui.spec.js	Adds unit tests for new Floating UI utility functions.
js/tests/unit/tooltip.spec.js	Updates tooltip tests for Floating UI behavior and new attributes/async show.
js/tests/unit/popover.spec.js	Adds/updates Popover data-api tests.
js/tests/unit/dropdown.spec.js	Updates dropdown tests for Floating UI behavior and new attributes; adds responsive placement tests.
js/src/util/floating-ui.js	Introduces Floating UI helper utilities (responsive placement parsing, media query listeners, RTL placement helpers).
js/src/tooltip.js	Replaces Popper integration with Floating UI computePosition/autoUpdate; adds responsive placement support and new data-api initialization.
js/src/popover.js	Adds Popover data-api auto-initialization wiring.
js/src/dropdown.js	Replaces Popper integration with Floating UI computePosition/autoUpdate; adds placement option and responsive placement parsing.
build/rollup.config.mjs	Updates Rollup externals/globals for @floating-ui/dom and bundling behavior.
build/generate-sri.mjs	Updates SRI generation input from Popper UMD to Floating UI UMD.
.github/dependabot.yml	Removes ignored dependency entry for @popperjs/core.
.bundlewatch.config.json	Updates bundle size thresholds to account for dependency switch/size changes.

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[MaxLardenois]

Still think we should investigate a css version with anchor positioning for Dropdown but in the meantime LGTM