Add invitation frontend: invite modal, pending invitations, no-company view

Members Index:
- "Invite Member" button opens InviteMemberModal (email + role dropdown)
- Pending invitations section shows below members table with cancel buttons
- Members store gains inviteMember, fetchPendingInvitations, cancelInvitation

CompanySwitcher:
- Shows pending invitations greyed out below active companies
- Each with Accept/Decline mini-buttons
- Accepting refreshes bootstrap and switches to new company

NoCompanyView:
- Standalone page for users with zero accepted companies
- Shows pending invitations with Accept/Decline or "no companies" message
- Route: /admin/no-company

Invitation Pinia store:
- Manages user's own pending invitations (fetchPending, accept, decline)
- Bootstrap populates invitations from API response

Global store:
- Bootstrap action stores pending_invitations from response

resources/scripts/admin/stores/members.js

@@ -12,6 +12,7 @@ export const useMembersStore = (useWindow = false) => {
       roles: [],
       users: [],
       totalUsers: 0,
+      pendingInvitations: [],
       currentUser: null,
       selectAllField: false,
       selectedUsers: [],
@@ -226,6 +227,63 @@ export const useMembersStore = (useWindow = false) => {
           this.selectAllField = true
         }
       },
+
+      fetchPendingInvitations() {
+        return new Promise((resolve, reject) => {
+          http
+            .get('/api/v1/company-invitations')
+            .then((response) => {
+              this.pendingInvitations = response.data.invitations
+              resolve(response)
+            })
+            .catch((err) => {
+              handleError(err)
+              reject(err)
+            })
+        })
+      },
+
+      inviteMember(data) {
+        return new Promise((resolve, reject) => {
+          http
+            .post('/api/v1/company-invitations', data)
+            .then((response) => {
+              const notificationStore = useNotificationStore()
+              notificationStore.showNotification({
+                type: 'success',
+                message: global.t('members.invited_message'),
+              })
+              this.fetchPendingInvitations()
+              resolve(response)
+            })
+            .catch((err) => {
+              handleError(err)
+              reject(err)
+            })
+        })
+      },
+
+      cancelInvitation(id) {
+        return new Promise((resolve, reject) => {
+          http
+            .delete(`/api/v1/company-invitations/${id}`)
+            .then((response) => {
+              const notificationStore = useNotificationStore()
+              notificationStore.showNotification({
+                type: 'success',
+                message: global.t('members.invitation_cancelled'),
+              })
+              this.pendingInvitations = this.pendingInvitations.filter(
+                (inv) => inv.id !== id
+              )
+              resolve(response)
+            })
+            .catch((err) => {
+              handleError(err)
+              reject(err)
+            })
+        })
+      },
     },
   })()
 }