Link the board wizard help to the new boards guide

[bdraco]

What does this implement/fix?

Wires the "I don't know what board I have" link on the board wizard step to the new boards guide; it was a no-op <button> before. It now opens https://esphome.io/guides/understanding_boards/ in a new tab. While here, adds a shared ESPHOME_DOCS_BASE constant and builds the existing api and script doc links from it too, so the docs origin lives in one place.

The guide page itself is esphome/esphome.io#6744; merge that first so the link is not a 404.

Related issue or feature (if applicable):

• fixes Implement I don't know what board I have link #114

Types of changes

• Bugfix (non-breaking change which fixes an issue) — bugfix
• New feature (non-breaking change which adds functionality) — new-feature
• Enhancement to an existing feature — enhancement
• Breaking change (fix or feature that would cause existing functionality to not work as expected) — breaking-change
• Refactor (no behaviour change) — refactor
• Documentation only — docs
• Maintenance / chore — maintenance
• CI / workflow change — ci
• Dependencies bump — dependencies

Checklist

• The code change is tested and works locally.
• npm run lint passes.
• npm run test passes.
• Tests have been added to verify that the new code works (where applicable).

[Copilot]

Pull request overview

This PR makes the “I don’t know what board I have” helper in the board-selection wizard actually navigate to the new ESPHome “Understanding boards” guide, and centralizes the ESPHome docs origin into a single constant for reuse across the UI.

Changes:

• Convert the previously no-op helper control in the board wizard into an external docs link to the new boards guide.
• Introduce ESPHOME_DOCS_BASE and rebuild existing Script/API docs fallback links from it.
• Add a shared docs URL constant for the new “Understanding boards” guide.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/components/wizard/wizard-step-board.ts	Implements the “don’t know board” helper as an external docs link built from the shared docs base.
src/components/device/automation-editor/script-editor.ts	Builds the script docs fallback URL from ESPHOME_DOCS_BASE instead of hardcoding the origin.
src/components/device/automation-editor/api-action-editor.ts	Builds the API component docs URL from ESPHOME_DOCS_BASE instead of hardcoding the origin.
src/common/docs.ts	Adds ESPHOME_DOCS_BASE as a shared constant for constructing docs links.

[esphbot]

PR Review — Link the board wizard help to the new boards guide

Clean, well-scoped enhancement. Merge-ready pending the companion docs PR.

• The no-op <button> is correctly converted to an <a> with target="_blank"; .helper-link styles (color/underline/cursor/font) apply cleanly to an anchor, and the button-only resets (border/background/padding) are harmless no-ops.
• ESPHOME_DOCS_BASE centralization is correct — both rebuilt URLs (/components/api.html, /components/script.html) and the new /guides/understanding_boards/ resolve correctly with no double slashes.
• Re Copilot's rel="noopener noreferrer" note: rel="noreferrer" already implies noopener per the HTML spec (window.opener is nulled), so tabnabbing is prevented as-is, and this matches the sibling more-info / ae-header-docs links in the same files. The change is consistent; adding noopener is optional, not required.
• As the PR description notes, Add Understanding boards in ESPHome guide esphome.io#6744 must merge first or the guide link 404s — coordinate the merge order.

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Checklist

• No hardcoded secrets
• External link tabnabbing protection
• URL construction correct (no double slashes)
• Consistent with existing repo patterns

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Automated review by Kōan (Claude) HEAD=0807987

[bdraco]

no harm in merging now the link is already missing