fix: restart opencode server on config changes and improve copy UX #55

Job	Run time
typecheck	32s
Rust tests (Windows)	12m 48s
Rust tests (Linux)	3m 9s
Rust tests (macOS)	1m 32s
test-js	1m 52s
lint	27s
Tauri build (${{ matrix.platform.name }})	0s
	20m 20s

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