Extract Thanos disintegrate effect into standalone npm package

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Summary

Extract the Thanos-style DOM disintegration effect from src/shared/ui/effects/thanosDisintegrate/ into a framework-agnostic npm package with an optional React adapter (useThanosDisintegrate).

This issue is scoped for a separate agent session. Design notes, comparison tables, and a checklist live in the repo:

• Design (comparison tables, API tiers, capture/mask modes, migration path): vibe-docs/ThanosDisintegrate-Library-Design.md
• Implementation checklist: vibe-docs/ThanosDisintegrate-Library-TODO.md

Context

• ~62 source files, 58 unit tests, first consumer is cookie consent dismiss (PR Thanos disintegrate: morpheus masks, worker offload, review hardening #153).
• Core API: runThanosDisintegrate(element, options) + useThanosDisintegrate() hook.
• Features: dual-layer masks (modal + particles), chunk bitmask worker with main-thread fallback, 15+ mask strategies, SnapDOM/SVG capture, ThanosDisintegrateError for explicit failures.

Recommended approach (from design doc)

Decision	Recommendation
Package layout	pnpm workspace package (packages/thanos-disintegrate) before separate repo
SnapDOM	Optional peer dependency
React hook	Separate entry: thanos-disintegrate/react
Migration	Re-export shim in src/shared/ui/effects/thanosDisintegrate/ for one release cycle

Acceptance criteria

• Package builds and tests pass independently (pnpm test in package)
• dStruct cookie consent still works via workspace dependency or shim
• No #/ or dStruct-specific imports in published package
• README documents mask modes, capture backends, and error codes
• Peer deps documented: react (optional), @zumer/snapdom (optional)

Out of scope

• Vue/Svelte adapters
• Publishing to npm (unless explicitly requested in follow-up)
• Changing the visual effect behavior

Labels / hints for agent

Read .cursorrules for dStruct conventions, but the library must not depend on MUI, Redux, tRPC, or i18n. Port prefersReducedMotion as an internal utility or option.