Fix hover text for ambient modules to display "module" instead of "namespace"

[Copilot]

Fix quick info/hover display for ambient modules

• Understand the issue - ambient modules like module "*.css" incorrectly show namespace "*.css" instead of module "*.css" in hover/quick info
• Locate the bug - found in /home/runner/work/typescript-go/typescript-go/internal/ls/hover.go at lines 366-371
• Create test case to validate the fix - added ambient module test
• Implement the fix to check for ambient modules using ast.IsAmbientModule()
• Run tests to ensure fix works - all quick info tests passing
• Verify no regressions with broader test suite - all tests pass
• Code review and security scan complete
• Remove duplicate namespace test (already covered by quickInfoDisplayPartsModules_test.go)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Quick info/hover on ambient module shows namespace keyword</issue_title>
<issue_description>

// @filename: foo.d.ts
module "*.css/*$*/";

Request quick info at /*$*/". It will result in

namespace "*.css"
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Quick info/hover on ambient module shows namespace keyword #2667

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[DanielRosenwasser]

@copilot go

[DanielRosenwasser]

Check if we already have a test for namespace quick info/hover. We probably do. If we do, delete this test.

[Copilot]

Removed the duplicate test. The existing quickInfoDisplayPartsModules_test.go already covers namespace quick info verification. (commit 09c1f76)

[Copilot]

Pull request overview

This pull request fixes a bug where hovering over ambient module declarations (e.g., declare module "*.css") incorrectly displayed "namespace" instead of "module" in the quick info/hover text.

Changes:

• Fixed the hover text logic to correctly identify ambient modules using ast.IsAmbientModule()
• Added a test case to verify ambient modules display as "module" rather than "namespace"

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
internal/ls/hover.go	Updated quick info generation to check for ambient modules (modules with string literal names) and display them as "module" instead of "namespace"
internal/fourslash/tests/quickInfoAmbientModule_test.go	Added test to verify ambient modules like declare module "*.css" show "module" in hover text