refactor: establish UIEvents folder feature

[jderochervlk]

Tracking issue: #342

Stack context

Part 22 of the Option 5 folder-feature stack.

• Previous: refactor: establish Observers folder feature #331
• Next: the Canvas folder layer

Review this PR as the incremental diff against #331.

Summary

• rename src/UIEvents to the target src/ui-events folder
• switch the folder to the unqualified internal UIEvents feature
• add the supported WebAPI.UIEvents -> WebAPI.DOMNodes + WebAPI.File + UIEvents feature
• preserve all existing flat UI event module paths and binding signatures

Temporary state

• the legacy broad WebAPI.DOM source entry remains until its remaining interfaces have been assigned
• final feature-graph guardrails and cleanup remain deferred until the stack is complete

Review focus

• the lowercase folder/internal feature transition
• the DOMNodes/File dependency closure
• preservation of flat public modules

Verification

• node_modules/.bin/rescript clean
• node_modules/.bin/rescript build --prod --features DOM,Event,DOMPlatform,Animation,CSSOM,Geometry,DOMNodes,File,UIEvents
• npm run build
• npm test
• npm run format:check
• git diff --check

[jderochervlk]

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Update documentation metadata for the renamed UIEvents folder

After moving this source to src/ui-events, the UIEvents API disappears from the generated documentation: featureSpecs still defines its dirName/sourceDir as UIEvents/src/UIEvents (scripts/unmonorepo/feature-spec.mjs), while docs/utils.js builds apiModules from that path and filters it out when UiEventsTypes.res is not found. Update the metadata or make the documentation tooling derive the new configured source directory so these public modules remain discoverable.

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