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Changes: - Replace tshark BPF validation with tcpdump -d (calls pcap_compile internally like ubridge, returns instantly without waiting for traffic) - Support multi-line BPF expressions: split on newlines and validate each line individually - Always validate, never save invalid filters on error - Drop invalid filters during project load with warning (prevents old topologies with bad filters from failing to open) - Simplify test cases (no longer depend on tshark availability)