refactor: establish SVG folder feature

[jderochervlk]

Tracking issue: #342

Stack context

Part 20 of the Option 5 folder-feature stack.

• Previous: refactor: establish WebAudio folder feature #329
• Next: the Observers folder layer

Review this PR as the incremental diff against #329.

Summary

• add the target src/svg folder on the unqualified internal SVG feature
• move SVGElement, SVGGraphicsElement, and SVGLength out of the legacy DOM folder
• add the supported WebAPI.SVG -> WebAPI.DOMNodes + WebAPI.Geometry + SVG feature
• preserve all existing flat SVG module paths and binding signatures

Temporary state

• the legacy broad WebAPI.DOM source entry remains until its remaining interfaces have been assigned
• Canvas still uses SVGElement and will acquire the SVG feature dependency in its later consolidation PR
• final feature-graph guardrails and cleanup remain deferred until the stack is complete

Review focus

• SVG folder membership
• the DOMNodes/Geometry dependency closure
• preservation of public module paths

Verification

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

[jderochervlk]

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