fix(refactor): rewrite absolute links in sub-pages when moving a section

[perber]

When a section with sub-pages was moved, absolute markdown links inside those sub-pages pointing to sibling pages within the same section were not updated. rewritePathChangedSubtree only ran RewriteRelativeLinksForPathChange which explicitly skips absolute links, and sub-pages are excluded from rewriteAffectedPages (which handles external pages only).

Add a second pass using engine.Rewrite for absolute intra-subtree links, short-circuited via strings.Contains to avoid a redundant goldmark parse when no matching absolute links can be present. Also cache current.CalculatePath() to a single call per page.

Adds three tests covering: absolute links in sub-pages to sibling sub-pages, relative links in sub-pages to external pages, and a regression guard ensuring intra-subtree relative links remain unchanged after the move.

[Copilot]

Pull request overview

This PR fixes link rewriting for moved sections by ensuring absolute Markdown links inside sub-pages (pointing to other pages within the moved subtree) are updated when the section is moved. It extends the existing subtree rewrite logic to cover absolute intra-subtree links that were previously skipped.

Changes:

• Add a second rewrite pass in rewritePathChangedSubtree to rewrite absolute Markdown links within the moved subtree, with a strings.Contains short-circuit to avoid unnecessary parsing.
• Cache current.CalculatePath() to avoid repeated path computation per page.
• Add three regression tests covering absolute intra-subtree links, external relative links from sub-pages, and ensuring intra-subtree relative links remain unchanged.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
internal/wiki/pages/refactor.go	Adds a second-pass rewrite for absolute intra-subtree Markdown links during subtree path changes, with a cheap pre-check and minor perf cleanup.
internal/wiki/pages/pages_test.go	Adds tests for the new absolute-link rewriting behavior and guards against unintended relative-link rewrites.

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