feat(remote): host-unreachable banner, manual wake, and native MAC wake-on-LAN

The reactive wake (typing into a session whose host slept) left the state invisible:
nothing told the user the machine was asleep, and with no wake target configured
there was nothing to do about it. Adds:

- RemoteHost.wakeMac (comma-separated) - Codeman builds and broadcasts the magic
  packet itself (UDP port 9), so the common case needs no external script. The
  existing wakeCommand stays as the explicit override.
- GET /api/sessions/:id/reachability - probes (throttled, cached, and it never
  wakes) and reports HOW the host can be woken, or that nothing is configured.
- POST /api/sessions/:id/wake - wakes, waits, reattaches the pane and flushes
  buffered input; 400 with a routable message when no target is configured.
- The amber host-unreachable banner + its 'Wake' / 'Configure WoL' action, and a
  small config dialog that saves via PUT /api/remote-hosts/:id.
- RemoteWakeDeps.resolveRemote: host config is re-resolved for LIVE sessions
  (throttled + cached), so saving the dialog takes effect without a restart.

src/types/session.ts

@@ -97,13 +97,23 @@ export interface RemoteHost extends RemoteSshOptions {
   username: string;
   port?: number;
   commands?: Partial<Record<RemoteCommandMode, string>>;
+  /**
+   * Optional Wake-on-LAN MAC address(es), comma-separated (e.g.
+   * `04:d9:f5:80:c6:58`). Codeman sends the magic packet itself (UDP port 9
+   * broadcast), so the common case needs no external script. A SLEEPING host's
+   * port-22 probe still fails, which is what triggers the wake — this only
+   * controls HOW the host is woken.
+   */
+  wakeMac?: string;
   /**
    * Optional Wake-on-LAN command that powers this host on from SLEEP (e.g. a
-   * wrapper script like `/home/joe/bin/whuff`). Absent = no wake support and
-   * today's behavior exactly. Executed WITHOUT a shell (a single executable
-   * path, never a command line), only from user input on a session whose host
-   * is unreachable — never from the auto-reconnect/boot-recovery path, which
-   * would re-wake a host seconds after each suspend.
+   * wrapper script like `/home/joe/bin/whuff`). TAKES PRECEDENCE over `wakeMac`
+   * (an explicit override for hosts that need a router/other-host wake). Absent
+   * = no wake support and today's behavior exactly. Executed WITHOUT a shell (a
+   * single executable path, never a command line), only from user input or an
+   * explicit wake request on a session whose host is unreachable — never from
+   * the auto-reconnect/boot-recovery path, which would re-wake a host seconds
+   * after each suspend.
    */
   wakeCommand?: string;
 }
@@ -151,6 +161,8 @@ export interface SessionRemote extends RemoteSshOptions {
    * so the input route can wake a sleeping host without re-reading the host list.
    */
   wakeCommand?: string;
+  /** Wake-on-LAN MAC address(es) from the host config (see `RemoteHost.wakeMac`). */
+  wakeMac?: string;
 }
 
 /**