Change completions to be sorted in reverse alphabetical order

[Copilot]

This PR implements reverse alphabetical sorting for TypeScript completions as requested in the issue.

Changes Made

Modified compareCompletionEntries function in src/services/completions.ts:

• Changed line 821 from compareStringsCaseSensitiveUI(entryInArray.name, entryToInsert.name)
• To compareStringsCaseSensitiveUI(entryToInsert.name, entryInArray.name)

This minimal change reverses the name comparison while preserving:

• Primary sorting by sortText (semantic priority remains intact)
• Module specifier-based sorting for auto-imports
• Symbol order fallback logic

Example

Before this change, completions were sorted alphabetically (A-Z):

const obj = { apple: 1, banana: 2, cherry: 3, zebra: 4 };
obj. // Completions: apple, banana, cherry, zebra

After this change, completions are sorted in reverse alphabetical order (Z-A):

const obj = { apple: 1, banana: 2, cherry: 3, zebra: 4 };
obj. // Completions: zebra, cherry, banana, apple

Testing

• Added focused test case completionReverseAlphabetical.ts to verify the new ordering
• Updated baseline tests to reflect the new sorting order
• All existing completion tests continue to pass
• Code successfully linted and formatted

Fixes #6.

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