feat(ui) introducing an lsp menu dialog to fit more features than just codeactions

[gat0sy]

Adds a dedicated LSP actions menu to the editor.

The tooltip button now opens the new LSP menu instead of directly showing code actions. Code actions have been moved into this menu alongside the other go-to actions.

The menu provides quick access to:

• Go to Definition
• Go to Declaration
• Go to Implementation
• Go to Type Definition
• Find References
• Rename Symbol
• Code Actions

Single-result actions are executed directly without opening the menu.

This PR is based on PR #2701

[greptile-apps]

Greptile Summary

The PR introduces a consolidated LSP actions menu and expands editor navigation, reference, rename, code-action, tooltip-link, and workspace-edit support.

• Aggregates capabilities across attached language-server clients when constructing the actions menu.
• Routes go-to operations to a client advertising the requested capability.
• Preserves multiple workspace-edit groups targeting the same URI by accumulating their edits.
• Adds shared LSP position and text-edit utilities.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains from the previously reported issues.

The menu now aggregates capabilities across attached clients and go-to operations select a supporting client, while workspace edits accumulate duplicate URI groups rather than overwriting earlier groups; no blocking failure remains.

Important Files Changed

Filename	Overview
src/lib/selectionMenu.js	Builds the LSP menu from capabilities merged across all attached clients, resolving the previously reported single-client discovery issue.
src/cm/lsp/definition.ts	Implements go-to requests by selecting a client that advertises the requested definition capability.
src/cm/lsp/transport.ts	Adds workspace/applyEdit handling and retains all edit groups that target the same URI, resolving the previously reported overwrite behavior.
src/cm/lsp/textEditUtils.ts	Centralizes LSP-position conversion and CodeMirror text-edit application.
src/cm/lsp/tooltipExtensions.ts	Adds navigation for file links rendered in hover and signature documentation.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  Button[LSP actions button] --> Menu[LSP actions menu]
  Menu --> Capability[Select supporting LSP client]
  Capability --> Navigation[Definitions and references]
  Capability --> Rename[Rename symbol]
  Capability --> Actions[Code actions]
  Actions --> WorkspaceEdit[Apply workspace edits]

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