Isolate dev state and forward server flags in dev runner

- default root dev commands to `T3CODE_STATE_DIR=~/.t3/dev`
- add `--` flag forwarding in `scripts/dev-runner.mjs` for server env flags
- resolve desktop state dir from `T3CODE_STATE_DIR` with new tests for desktop and dev runner
923837537bJulius Marminge committed on 2/27/2026, 2:01:14 AMparent5748a99
6 files changedLine totals unavailable