chore(atomic): migrate atomic-insight-result-action to Lit

[alexprudhomme]

Summary

Migrates atomic-insight-result-action from Stencil to Lit, including new unit tests, E2E tests, Storybook stories, and MDX documentation.

Scout camping 🏕️

Small improvements discovered during review, applied for parity or correctness:

• Tooltip reset timeout cleanup — the original Stencil component never cleared the setTimeout used for the "Copied!" tooltip flash. Added disconnectedCallback cleanup and rapid-click debounce (clearTimeout before re-setting).
• Null-result guard — render() and onClick() now bail early when the result context is unavailable, preventing runtime errors.
• @reference fix in atomic-insight-user-actions-timeline — corrected a wrong Tailwind @reference path that pointed to a non-existent file.
• @reference addition in atomic-insight-user-actions-session — added the missing Tailwind @reference import.

Editorial choices 📝

• JSDoc focuses on "what", MDX on "how" — the class-level JSDoc describes the component's purpose; the MDX Usage section shows both placement options (always-visible in atomic-result-section-actions, hover-reveal in atomic-insight-result-action-bar) with markup examples.
• @internal tag intentionally removed — the Stencil original had @internal, but removing it is required for the component to appear in the custom elements manifest used by Storybook.
• static styles over Tailwind class prop — the component uses a [part='result-action-button'] CSS selector to override renderIconButton defaults (h-8 w-8 vs the default h-[2.6rem] w-[2.6rem]). This is more reliable than Tailwind class composition, where conflicting utility classes have non-deterministic resolution based on stylesheet generation order.
• Stories trimmed to two — Default (with action dropdown control covering all 5 action types) and InActionBar (showing the hover-reveal placement). Per-action stories were redundant.
• E2E consolidated — a single happy-path test asserts all three parts are visible, rather than three separate tests checking one part each.

✅ Checklist

• 🧪 The component is unit tested
• 🧪 The component includes E2E tests
• 🗑️ Old Cypress tests exclusive to the component are removed N/A: No Cypress tests existed for this component
• 📖 The component is documented in storybook with an .mdx file
• ♿ The component complies with the Web Content Accessibility Guidelines.
• 🌐 All strings intended for humans or assistive technology must be localized with i18n. N/A: No user-facing strings; tooltip text is consumer-provided via props
• 📦 The Lit component is exported in the appropriate index.ts and lazy-index.ts files.
• 🎨 CSS parts are documented still accessible.
• 🦥 Slotted Content, public methods and properties are documented
• 🔄 The component outputs the same Angular output as before with Stencil
• 🏷️ The component declares the component type in the HTMLElementTagNameMap

https://coveord.atlassian.net/browse/KIT-5482

[alexprudhomme]

Approved 👍