Phone runtime (2b): inventory phone on the board dials for real

The phone gains a session mode that reads the live directory (/phone) and
dials (/dial); the inventory threads it through. On a campaign level the
board shows an INVENTORY nav button that opens the tool rack, and connecting
a call hands back to the campaign via /?resume=1 (a fast-path that resumes
the current node instead of the splash). On Barricelli's note-board: open
inventory -> phone -> dial 5550100 -> Glitch Hunter.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/inventory.tsx

@@ -1,6 +1,6 @@
 import { useEffect, useRef, useState } from 'react'
 import * as THREE from 'three'
-import { buildPhone, CLOSED_ANGLE, PhonePreview } from './phone'
+import { buildPhone, CLOSED_ANGLE, PhonePreview, type PhoneSession } from './phone'
 
 // A reusable "tools" inventory: a three.js rack you cycle through, one 3D tool at a
 // time, then USE to open it. Tool-driven (see TOOLS below), so it isn't tied to any
@@ -85,13 +85,13 @@ function ToolRack({ index }: { index: number }) {
   return <div ref={stageRef} className="inv-stage" />
 }
 
-export function Inventory({ onClose }: { onClose?: () => void }) {
+export function Inventory({ onClose, session }: { onClose?: () => void; session?: PhoneSession }) {
   const [index, setIndex] = useState(0)
   const [active, setActive] = useState<string | null>(null)
 
   if (active) return <div className="inv-tool">
     <button className="inv-back" onClick={() => setActive(null)}>‹ TOOLS</button>
-    {active === 'phone' ? <PhonePreview /> : <NotebookTool />}
+    {active === 'phone' ? <PhonePreview session={session} /> : <NotebookTool />}
   </div>
 
   return <div className="inv-backdrop">