refactor: run a single shared codex app server (#479) #1522

Job	Run time
typecheck	22s
lint	22s
test-js	1m 6s
Rust tests (Windows)	1m 21s
Rust tests (macOS)	1m 24s
Rust tests (Linux)	1m 56s
Tauri build (${{ matrix.platform.name }})	0s
	6m 31s

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