v0.151.0 — the Megosztás page stops reloading, and says how to connect

S-1: /sharing/status coerced idle->running on the PHASE channel, so the first
poll of every steady-state page load reported a terminal job that never ran and
the client's repaint-reload fired ~1.2s apart, forever. The coercion's real duty
(liveness must never be contradicted) belongs to the 'running' LEVEL field
beside it, and is now pinned by its own regression test.

S-4 core: a terminal 'running' is served exactly once, so a REAL bring-up cannot
re-arm the reload on the page it just caused. failed/needs_password/in-flight
are never consumed. Unified async-job feedback stays the ROADMAP item.

S-2/S-5: new connect card with the Windows form, the Mac form and the direct
smb://<IP>, read from the SAMBA container's netns (the controller is on a docker
bridge and would answer 172.x). Derived per render, cached nowhere - the address
is a DHCP lease. Underivable => the line is omitted.

sharing.html's <script> block is byte-identical to v0.150.0. Red-proofed three
ways. 23/23 packages green.

controller/internal/infra/samba.go

@@ -30,6 +30,12 @@ type SambaData struct {
 // SambaHouseholdUser is the single household SMB account name (matches the entrypoint's unix user).
 const SambaHouseholdUser = "felhom"
 
+// SambaHostInterface is the guest's LAN interface, and the single source of truth for it: smb.conf's
+// `interfaces =` line, the container's FELHOM_IFACE env, and the controller's LAN-address read
+// (stacks.SambaLANAddress, v0.151.0) must all name the SAME nic or the service and the address the
+// page prints drift apart.
+const SambaHostInterface = "eth0"
+
 // SambaContainerName is the fixed container name the compose render pins. It is THE single source of
 // truth for it: the renderer below interpolates this constant, stacks.sambaContainer aliases it for
 // the exec paths, monitor's effective-protected set watches it (R-7b liveness), and the backup
@@ -62,7 +68,7 @@ func RenderSambaConfig(d SambaData) string {
 	b.WriteString("  server min protocol = SMB2\n")
 	b.WriteString("  disable netbios = no\n")
 	b.WriteString("  bind interfaces only = yes\n")
-	b.WriteString("  interfaces = lo eth0\n")
+	fmt.Fprintf(&b, "  interfaces = lo %s\n", SambaHostInterface)
 	b.WriteString("  smb ports = 445\n")
 	b.WriteString("  load printers = no\n")
 	b.WriteString("  printing = bsd\n")
@@ -117,7 +123,7 @@ services:
     network_mode: host
     environment:
       - FELHOM_SERVER_NAME=%[3]s
-      - FELHOM_IFACE=eth0
+      - FELHOM_IFACE=%[8]s
       - FELHOM_UID=%[4]d
       - FELHOM_GID=%[4]d
     volumes:
@@ -126,5 +132,5 @@ services:
 %[7]s
 volumes:
   %[5]s:
-`, SambaContainerName, SambaImage, d.ServerName, d.UID, SambaPassdbVolume, SambaPassdbMount, binds.String())
+`, SambaContainerName, SambaImage, d.ServerName, d.UID, SambaPassdbVolume, SambaPassdbMount, binds.String(), SambaHostInterface)
 }