diff --git a/api/TPEN.js b/api/TPEN.js
index 7e4bcd36..56373a16 100644
--- a/api/TPEN.js
+++ b/api/TPEN.js
@@ -61,6 +61,14 @@ class Tpen {
         eventDispatcher.on("tpen-user-loaded", ev => this.currentUser = ev.detail)
         eventDispatcher.on("tpen-project-loaded", ev => this.activeProject = ev.detail)
 
+        // Centralized token expiration UX: notify user and redirect to login
+        let expirationTimeout = null
+        eventDispatcher.on('token-expiration', () => {
+            if (expirationTimeout) return
+            eventDispatcher.dispatch('tpen-toast', { status: 'error', message: 'Your session has expired. Redirecting to login...' })
+            expirationTimeout = setTimeout(() => this.login(), 4000)
+        })
+
         if (this.screen.projectInQuery) {
             try {
                 import('./Project.js').then(module => {
diff --git a/components/new-action.js b/components/new-action.js
index a00c9d0a..21a4d0bb 100644
--- a/components/new-action.js
+++ b/components/new-action.js
@@ -94,7 +94,8 @@ class NewAction extends HTMLElement {
     }
 
     TPEN2ImportHandler = async () => {
-        const userToken = localStorage.getItem("userToken")
+        const userToken = TPEN.getAuthorization()
+        if (!userToken) return TPEN.login()
         let tokenDomain
         let isProdTPEN
     
diff --git a/interfaces/manage-columns/index.js b/interfaces/manage-columns/index.js
index c844853b..9b17766d 100644
--- a/interfaces/manage-columns/index.js
+++ b/interfaces/manage-columns/index.js
@@ -305,7 +305,11 @@ class TpenManageColumns extends HTMLElement {
 
     connectedCallback() {
         TPEN.attachAuthentication(this)
-        localStorage.removeItem('annotationsState')
+        if (!TPEN.screen.projectInQuery) {
+            this.showError("No project id provided")
+            return
+        }
+        localStorage.removeItem(`annotationsState:${TPEN.screen.projectInQuery}`)
         if (!TPEN.screen.pageInQuery) {
             this.showError("No page id provided")
             return
@@ -403,7 +407,7 @@ class TpenManageColumns extends HTMLElement {
                 }))
             })
             this.totalIds = annotations.filter(anno => !assignedAnnotationIds.some(a => a.lineId === anno.lineId)).map(a => a.lineId)
-            localStorage.setItem('annotationsState', JSON.stringify({
+            localStorage.setItem(`annotationsState:${TPEN.screen.projectInQuery}`, JSON.stringify({
                 remainingIDs: this.totalIds,
                 selectedIDs: []
             }))
@@ -526,7 +530,7 @@ class TpenManageColumns extends HTMLElement {
         this.totalIds = this.cachedAnnotations
             .filter(anno => !assignedAnnotationIds.some(a => a.lineId === anno.lineId))
             .map(a => a.lineId)
-        localStorage.setItem('annotationsState', JSON.stringify({
+        localStorage.setItem(`annotationsState:${TPEN.screen.projectInQuery}`, JSON.stringify({
             remainingIDs: this.totalIds,
             selectedIDs: []
         }))
@@ -927,7 +931,7 @@ class TpenManageColumns extends HTMLElement {
     }
 
     restoreAnnotationState() {
-        const saved = localStorage.getItem('annotationsState')
+        const saved = localStorage.getItem(`annotationsState:${TPEN.screen.projectInQuery}`)
         if (!saved) return
         const { selectedIDs = [] } = JSON.parse(saved)
         const boxes = Array.from(this.shadowRoot.querySelectorAll('.overlayBox'))
@@ -1023,7 +1027,7 @@ class TpenManageColumns extends HTMLElement {
         const selectedIDs = this.selectedBoxes.map(b => b.dataset.lineId)
         const remainingIDs = this.totalIds.filter(id => !this.selectedBoxes.some(b => b.dataset.lineId === id))
         try {
-            localStorage.setItem('annotationsState', JSON.stringify({ remainingIDs, selectedIDs }))
+            localStorage.setItem(`annotationsState:${TPEN.screen.projectInQuery}`, JSON.stringify({ remainingIDs, selectedIDs }))
         } catch (e) {
             // localStorage may be unavailable (e.g., private mode, quota exceeded)
             // Silent fail as this is just a convenience feature