Path-prefix routing (`localhost:9100/<id>/`) broke SPAs because absolute
asset paths (`/assets/index.js`) didn't match the `handle_path /<id>/*`
route. Subdomain routing (`<id>.localhost:9100/`) resolves this since
all paths are relative to the root. Chrome/Firefox resolve *.localhost
to 127.0.0.1 natively — no DNS setup needed.
The Caddyfile was using the host port (e.g., 9100) as the Caddy listen
address, but Docker maps host:9100 → container:80. Caddy inside the
container was listening on 9100 while Docker only forwarded to port 80,
causing all health checks to fail with "connection reset by peer".
Two fixes:
- Call previewsQuery.refetch() in startPreview.onSuccess so the UI
transitions from "building" to the preview link without a page refresh.
- Switch from subdomain routing (*.localhost) to path-based routing
(localhost:<port>/<id>/) since macOS doesn't resolve wildcard
localhost subdomains.
Refactor preview deployments to use a single shared Caddy gateway container
with subdomain routing (<previewId>.localhost:<port>) instead of one Caddy
sidecar and one port per preview. Adds dev/preview modes, git worktree
support for branch checkouts, and auto-start on phase:pending_review.
- Add GatewayManager for shared Caddy lifecycle + Caddyfile generation
- Add git worktree helpers for preview mode branch checkouts
- Add dev mode: volume-mount + dev server image instead of build
- Remove per-preview Caddy sidecar and port publishing
- Use shared cw-preview-net Docker network with container name DNS
- Auto-start previews when phase enters pending_review
- Delete unused PreviewPanel.tsx
- Update all tests (40 pass), docs, events, CLI, tRPC, frontend
