refactor: establish Navigator folder feature

[jderochervlk]

Tracking issue: #342

Stack context

Part 26 of the Option 5 folder-feature stack.

• Previous: refactor: establish Workers folder feature #335
• Next: refactor: complete Canvas interface ownership #337 and refactor: complete Device interface ownership #338 (final Canvas and Device ownership follow-ups)

Review this PR as the incremental diff against #335.

Summary

• add the target src/navigator folder on the unqualified internal Navigator feature
• move the central Navigator interface out of the legacy DOM folder
• consolidate Clipboard, Credential Management, and Permissions interfaces into the Navigator domain
• add the supported Navigator feature with DOMPlatform, Device, Media, Storage, and Workers dependencies
• remove the old standalone Clipboard, Credential Management, and Permissions source features
• preserve all existing flat public module paths

Dependency note

The provisional Option 5 map listed only DOMPlatform and Device. The current Navigator signatures also expose media capabilities/devices/session, storage, service workers, fetch/file/url payloads, clipboard, credentials, and permissions. The broader compiler-proven closure records that existing surface rather than silently omitting modules required by the public interface.

Temporary state

• the legacy broad WebAPI.DOM source entry remains for Window, Document, and the final unassigned interfaces
• the Navigator surface remains intentionally broad; reducing individual accessors would be a separate API design change
• final feature-graph guardrails and helper cleanup remain deferred until the stack is complete

Review focus

• Navigator domain membership
• the expanded dependency closure
• preservation of flat Clipboard/Credentials/Permissions module paths

Verification

• node_modules/.bin/rescript clean
• node_modules/.bin/rescript build --prod --features DOM,Event,DOMPlatform,Animation,CSSOM,Geometry,DOMNodes,File,HTML,Media,URL,Fetch,Storage,Messaging,Workers,Device,Navigator
• npm run build
• npm test
• npm run format:check
• git diff --check

[jderochervlk]

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