feat(link): add container import UI with drag-drop decryption (task 42) #155

Acknowledged Regression: -18.88%

⚡ 2 improved benchmarks
❌ 6 (👁 6) regressed benchmarks
✅ 18 untouched benchmarks

	Benchmark	`BASE`	`HEAD`	Efficiency
👁	`ftp_scheme`	2.6 µs	2.8 µs	-10.09%
👁	`simple_https`	2.4 µs	2.7 µs	-11.51%
⚡	`normalize_link_check_parallelism`	150 ns	120.8 ns	+24.14%
👁	`with_userinfo`	2.6 µs	3.1 µs	-16.5%
⚡	`normalize_max_concurrent`	150 ns	120.8 ns	+24.14%
👁	`complex_with_port_and_path`	2.6 µs	3.2 µs	-16.04%
👁	`from_status_code_404`	154.7 ns	183.9 ns	-15.86%
👁	`from_status_code_500`	125.3 ns	154.4 ns	-18.88%

_{Comparing feat/task-42-import-containers-ui (ae1f591) with main (c00d74b)}