feat(core): add text selection affordances

[vamgan]

Summary

• add opt-in selected-text affordances with persisted text marks and anchored prompt submit hooks
• expose selected text theme and option types from the core entrypoint
• keep selection handles available after once captures so persisted affordances can be cleared in React, Vue, and Svelte wrappers
• update the website demo and docs for highlighted-text prompts

Validation

• npm test -w @askable-ui/core -- selection.test.ts
• npm run build
• npm test -w @askable-ui/react -- useAskableRegionCapture.test.tsx useAskableTextSelectionCapture.test.tsx
• npm test -w @askable-ui/vue -- useAskableRegionCapture.test.ts useAskableTextSelectionCapture.test.ts
• npm test -w @askable-ui/svelte -- store.test.ts
• npm run build:versioned --prefix site/docs
• git diff --check
• browser interaction check against http://localhost:4186 for highlighted text prompt submit and region prompt clearing

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Project	Deployment	Actions	Updated (UTC)
askable	Ready	Preview, Comment	Jun 2, 2026 6:15am

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commit: 7f54c8c