refactor: establish Canvas folder feature

[jderochervlk]

Tracking issue: #342

Stack context

Part 23 of the Option 5 folder-feature stack.

• Previous: refactor: establish UIEvents folder feature #332
• Next: the Storage folder layer

Review this PR as the incremental diff against #332.

Summary

• rename src/Canvas to the target src/canvas folder
• switch the folder to the unqualified internal Canvas feature
• add the supported Canvas public feature with Geometry, HTML, Media, and SVG dependencies
• preserve all existing flat Canvas module paths and binding signatures

Dependency note

The proposal listed Geometry and HTML. The current Canvas bindings also accept SVGElement image values and HTMLVideoElement media values, so the compiler-proven closure additionally implies WebAPI.SVG and WebAPI.Media.

Temporary state

• VideoColorSpace remains in the legacy DOM folder; Canvas uses the foundational DOM.videoColorSpace type and does not require that interface module
• 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 additional SVG/Media dependencies
• the lowercase folder/internal feature transition
• 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,HTML,Media,SVG,Canvas
• npm run build
• npm test
• npm run format:check
• git diff --check

[jderochervlk]

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