fix: skip invalid repo-map tree-sitter queries

[pragnyanramtha]

Summary

• catch tree-sitter QueryError while running repo-map tag queries
• keep affected files in the repo map as filename-only entries instead of crashing
• add a regression test that forces an invalid tags query

Motivation

A bundled tags query can drift out of sync with the installed tree-sitter grammar. Julia files currently hit this path with Invalid node type ... module, which aborts repo-map generation before Aider can answer the next prompt.

Fixes #4867
Fixes #4888

Validation

• .venv/bin/python -m pytest tests/basic/test_repomap.py::TestRepoMap::test_get_repo_map_skips_invalid_tree_sitter_query -q
• .venv/bin/python -m pytest tests/basic/test_repomap.py -q
• .venv/bin/pre-commit run --files aider/repomap.py tests/basic/test_repomap.py
• git diff --check
• manual hello.jl repo-map smoke test now returns hello.jl instead of raising tree_sitter.QueryError

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