Improve linked symbol anchors with tree-sitter fallback

[pranavvaid-ac]

Adds an eager tree-sitter fallback for linked-backtick symbol references so links open near the referenced symbol even before an LSP DocumentSymbolProvider result is available. Before this PR, links to referenced symbols would just take you to the top of the file if an LSP was not available.

Changes:

• Resolve initial linked symbol locations from tree-sitter when LSP symbols are unavailable.
• Prefer declaration-like tree-sitter symbols before generic identifier matches.
• Cache parsed file symbols during linkification to avoid repeated parsing for the same file.
• Keep the existing LSP resolve path so symbol kind and more precise document-symbol locations can still upgrade later.
• Add tests for exact matches, qualified-name fallback, parser caching, linkifier integration, and LSP kind/location upgrades.

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[Copilot]

Pull request overview

Adds an eager tree-sitter-based fallback to the linkify pipeline so linked-backtick symbol anchors can open near a symbol before document symbols are available, while still allowing later LSP-based upgrades.

Changes:

• Injects parser-based symbol lookup into SymbolLinkifier and keeps the existing document-symbol resolve path for later upgrades.
• Adds findSymbolLocationInFile plus shared symbol-name extraction to support exact and qualified-name fallback with per-linkification file-symbol caching.
• Expands linkify tests to cover initial tree-sitter locations, declaration preference, qualified fallback, cache reuse, and LSP upgrade behavior.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/extension/linkify/vscode-node/symbolLinkifier.ts	Uses tree-sitter to seed initial linked-symbol locations and adds resolve-time logging/helpers.
src/extension/linkify/vscode-node/findWord.ts	Adds file-level symbol lookup/cache logic used by linked symbol anchors.
src/extension/linkify/vscode-node/findSymbol.ts	Exports shared inline-code symbol-part extraction.
src/extension/linkify/test/vscode-node/symbolLinkifier.test.ts	Adds integration-style tests for tree-sitter fallback, cache reuse, and LSP upgrades.
src/extension/linkify/test/vscode-node/findWord.test.ts	Adds unit tests for exact/declaration/qualified-name symbol lookup and cache behavior.