Add customComponent flag for plugin tag configurations

[gerteck]

Enables Vue compiler to recognize custom HTML elements

What is the purpose of this pull request?

• Documentation update
• Bug fix
• Feature addition or enhancement
• Code maintenance
• DevOps
• Improve developer experience
• Others, please explain:

Overview of changes:

Adds support for plugins to configure specific tags as "custom elements" to be ignored by the Vue compiler.

Currently, if a plugin introduces Custom Elements (Web Components), Vue attempts to resolve them as Vue components during SSR, leading to warnings or errors. This PR allows plugins to opt-in to the isCustomElement compiler option via tagConfig.

• packages/core: Updated TagConfigs type in Plugin.ts to include the customComponent property.
• packages/core: Updated PageVueServerRenderer.ts to collect tags with customComponent: true from the PluginManager and pass them to the Vue compilerOptions.isCustomElement check.
• docs: Updated writingPlugins.md to document the new configuration option.

Anything you'd like to highlight/discuss:

Testing instructions:

• Verified that tags marked with customComponent: true are ignored by the Vue component resolver and preserved as custom elements in the output.

Proposed commit message: (wrap lines at 72 characters)

Add customComponent flag for plugin tag config

Adds support for plugins to configure specific tags as
"custom elements" to be ignored by the Vue compiler.

---

Checklist: ☑️

• Updated the documentation for feature additions and enhancements
• Added tests for bug fixes or features
• Linked all related issues
• No unrelated changes

---

Reviewer checklist:

Indicate the SEMVER impact of the PR:

• Major (when you make incompatible API changes)
• Minor (when you add functionality in a backward compatible manner)
• Patch (when you make backward compatible bug fixes)

At the end of the review, please label the PR with the appropriate label: r.Major, r.Minor, r.Patch.

Breaking change release note preparation (if applicable):

• To be included in the release note for any feature that is made obsolete/breaking

Give a brief explanation note about:

• what was the old feature that was made obsolete
• any replacement feature (if any), and
• how the author should modify his website to migrate from the old feature to the replacement feature (if possible).

[Copilot]

Pull request overview

This PR adds support for plugins to configure custom HTML elements (Web Components) that should be ignored by the Vue compiler during server-side rendering. This prevents Vue from attempting to resolve custom elements as Vue components, which would cause warnings or errors.

Changes:

• Added optional customComponent boolean flag to the TagConfigs type definition
• Implemented filtering of custom element tags in the Vue compiler configuration
• Updated documentation to explain the new configuration option

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/core/src/plugins/Plugin.ts	Added optional customComponent property to TagConfigs type
packages/core/src/Page/PageVueServerRenderer.ts	Collected custom element tags from PluginManager and configured Vue compiler's isCustomElement option
docs/devGuide/development/writingPlugins.md	Documented the new customComponent tag configuration property

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 71.67%. Comparing base (a12f57a) to head (d382482).

Files with missing lines	Patch %	Lines
packages/core/src/Page/PageVueServerRenderer.ts	80.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2786   +/-   ##
=======================================
  Coverage   71.67%   71.67%           
=======================================
  Files         134      134           
  Lines        7286     7291    +5     
  Branches     1609     1525   -84     
=======================================
+ Hits         5222     5226    +4     
- Misses       1937     2019   +82     
+ Partials      127       46   -81     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

This new feature lacks test coverage. Consider adding tests to verify that tags with customComponent: true are correctly passed to the Vue compiler's isCustomElement option. This would help ensure the feature works as expected and prevent regressions in the future.