feat(types): ✨ add rework-types runtime candidates

[lukas-runge-bot]

Summary

Draft extraction of small, still-potentially-useful candidates from old PR #1 / branch rework-types for selective runtime verification against grandMA3 Lua.

Linked old PR: #1

Included candidates:

• Type Obj.HasActivePlayback() as boolean
• Add candidate SequenceProps.appearance: Appearance | null
• Add candidate UserProfile.SelectedPage: number
• Add @noResolution hint to ftp module docs
• Restore lua.gma3_helpers declarations from old rework-types branch

Not included from #1 because current main already supersedes it:

• Old Pages model
• Old Remotes model
• Old HookObjectChange typing
• Old ObjDef / object structure rework
• Appearance color props that current main already covers with current casing

Notes

This PR is intentionally draft. The goal is not to merge blindly, but to provide a small reviewable surface where individual pieces can be kept or dropped depending on what actually correlates with the current MA3 Lua runtime.

Test Plan

• npm run lint:check
• npx tsc --noEmit --pretty false
• git diff --check origin/main...HEAD