fix: rank backlink suggestions by link count

[ocavue]

The [[/@ menu now ranks notes that are linked more often above rarely linked ones, and picks its candidates by link count before recency, so a much-linked note no longer sinks to the bottom or drops out because its file was edited long ago.

Summary by CodeRabbit

• Improvements

  • Wiki suggestions now prioritize exact title and alias matches, followed by prefix and partial matches.
  • Frequently linked notes receive stronger ranking, while recently modified notes help break ties.
  • Empty searches now surface highly linked non-daily notes and exclude daily notes.
  • Suggestions recognize links created through aliases and connect them to the corresponding notes.

• Tests

  • Added coverage for link-based ranking, alias links, exact-match precedence, recency tie-breaking, and empty-query behavior.

[coderabbitai]

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⚙️ Run configuration

Configuration used: Organization UI

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Run ID: bb3b1995-2afd-4510-8246-ea411fd099fb

📥 Commits

Reviewing files that changed from the base of the PR and between 4c8575d and dd9ea20.

📒 Files selected for processing (4)

• packages/core/src/indexing/link-usage-flow.test.ts
• packages/core/src/indexing/queries-suggestions.ts
• packages/core/src/indexing/suggest.test.ts
• packages/core/src/indexing/suggest.ts

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