redesign: 2-col layout, peers in sidebar, IRC-style messages, NAT dot

- Peers moved from right panel into sidebar below Rooms
- Messages left-aligned IRC style: time · alias · text
- Per-peer colored dot: green=direct/NAT-punched, amber=relay/connecting, red=failed
- Hover title on peer row shows full ID, connection type, remote address, last seen
- Removed right PeerList panel

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/src/types.ts

@@ -40,6 +40,9 @@ export interface FileOffer {
 
 // ── IPC message types ─────────────────────────────────────────────────────────
 
+export type CandidateType = 'host' | 'srflx' | 'relay' | 'unknown'
+export type PeerConnState = 'new' | 'connecting' | 'connected' | 'disconnected' | 'failed' | 'closed'
+
 export type IpcMsgType =
   // commands
   | 'send_message'
@@ -67,6 +70,7 @@ export type IpcMsgType =
   | 'invite_generated'
   | 'identity_exported'
   | 'identity_imported'
+  | 'peer_status'
   | 'error'
 
 export interface IpcMessage {
@@ -104,4 +108,8 @@ export interface IpcMessage {
   error_message?: string
   invite?: string
   files?: FileEntry[]
+  // peer_status
+  conn_state?: PeerConnState
+  candidate_type?: CandidateType
+  remote_address?: string
 }