Fix require() inside functions being treated as imports

[misrasaurabh1]

Summary

• Fixed a bug where dynamic require() calls inside function/method bodies were incorrectly treated as module-level imports
• This caused invalid code to be sent to the AI service, resulting in "Invalid TypeScript: Invalid syntax" errors
• Root cause: the tree traversal for finding imports didn't exclude function bodies

Example

The code:

class BloomFilter {
    export() {
        const gzipSize = (
            require('next/dist/compiled/gzip-size') as typeof import('next/dist/compiled/gzip-size')
        ).sync(filterData)
    }
}

Would incorrectly extract require('next/dist/compiled/gzip-size') as typeof import('next/dist/compiled/gzip-size') as an import, which when added to the top of the file creates invalid syntax.

Test plan

• Added test test_require_inside_function_not_import
• All 44 existing treesitter_utils tests pass
• Verified that the bloom-filter.ts export method no longer causes invalid syntax errors

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