fix(mafia-vue): prevent game master from kicking themselves

Two-part guard so the GM cannot accidentally kick themselves out of
the room (which used to leave the room hostless until someone else
claimed it):

  - Template: change the per-player kick button's v-if from 'admin'
    to 'admin && !p.admin', hiding the X next to the GM's own row.
  - Method: defensive check in kickPlayer — if the target name
    matches this.iPlayer.name, flash an alert and short-circuit
    before emitting the socket event. Covers the case where the
    component state somehow lets the button slip through, and
    keeps the rule local to the component without needing a
    server-side change.

ReARM-Agentic-Session: no-self-kick-1779379668
ReARM-Agent: 324b2ca3-403e-4126-b353-4787140daa65

Author: Claude Code Agent

mafia-vue/src/components/CardShuffle.vue

@@ -41,7 +41,7 @@
                     <option v-for="i in computedOrderArray" :key="i" :value="i">{{ i }}</option>
                 </select>
                 <button
-                    v-if="admin"
+                    v-if="admin && !p.admin"
                     class="player-kick"
                     type="button"
                     title="Kick player"
@@ -335,6 +335,10 @@ export default {
             }
         },
         kickPlayer (name) {
+            if (name === this.iPlayer?.name) {
+                this.flashAlert('You cannot kick yourself out of the room.')
+                return
+            }
             this.$socket.emit('kickplayer', { room: this.room, name })
         },
         requestMyPlayer () {