feat: guided product tour + Layer icon + "Form Builder" label

[devCluna]

Summary

• Guided tour — a dependency-free product tour of the builder. It spotlights the field palette, canvas, Settings (opening the drawer to point out Public page and Custom styles), the Style tab, Preview, Embed and Publish. Auto-runs once per browser (localStorage) and is re-launchable from a ? button. Tooltip placement stays fully on-screen (below → above → beside for tall targets).
• Embed button — now always rendered, disabled until the form is saved (previously hidden on new forms), so it's discoverable and the tour can point at it.
• Icon + label — replaces the default puzzle-piece with the Layer glyph (inlined SVG, independent of the installed @strapi/icons version) and sets the sidebar label / hover tooltip to "Form Builder".

Tests

• Extracted placeTooltip and unit-tested it: below short targets, above bottom-edge targets, beside full-height targets (the "first steps clipped at the top" regression), missing-target centering, and far-right clamping. 31/31 pass.

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Review details

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 8787edb9-7494-4731-be2e-684c19c9913f

📥 Commits

Reviewing files that changed from the base of the PR and between 22e811f and c0261f7.

📒 Files selected for processing (6)

• admin/src/components/FieldPalette.tsx
• admin/src/components/GuidedTour.tsx
• admin/src/components/PluginIcon.tsx
• admin/src/index.ts
• admin/src/pages/FormBuilderPage.tsx
• tests/guided-tour.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/guided-tour

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