fix: show content file path in render error messages

[xingzihai]

Summary

Improves error messages when template rendering fails by showing the content file path, making it easier for users to locate the problematic file.

Problem

Previously, when a template render failed, the error message only showed:

render of "page" failed: execute of template failed...

This made it difficult for users to identify which content file caused the error.

Solution

Modified renderForTemplate() in site.go to use getPageInfoForError() which provides detailed page information:

• kind: Page type (e.g., "page", "home", "section")
• path: Page path (e.g., "posts/my-post")
• file: Content file path (e.g., "/content/posts/my-post.md")

New error message format:

render of "kind: "page", path: "posts/my-post", file: "/content/posts/my-post.md"" failed: execute of template failed...

Changes

• hugolib/site.go - Modified renderForTemplate to use getPageInfoForError() for better error context

Testing

• go build ./... ✓
• go test -v -run TestRender ./hugolib/... ✓

Fixes #14607

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