Add graduation and award news (#217)

* Remove overlapping news items

* Add graduation and award news

Author: doh-ha

src/data/posts.ts

@@ -15,6 +15,27 @@ export class Post {
 }
 
 export const POSTS: Post[] = [
+  {
+    title: 'Three Ph.D. Students and One M.S. Student Successfully Defended Their Theses',
+    date: new Date('2026-02-20'),
+    categories: ['news'],
+    summary:
+      'We are proud to announce that Eunyoung, Saelyne, and Taesoo successfully defended their Ph.D. dissertations, and Yeon Su successfully defended her M.S. thesis. Congratulations to all!',
+  },
+  {
+    title: 'Outstanding Paper Awards – School of Computing',
+    date: new Date('2026-01-30'),
+    categories: ['award'],
+    summary:
+      'Eight KIXLAB members received the Outstanding Paper Awards, presented annually to graduating M.S. and Ph.D. students in the School of Computing. Congratulations to Eunyoung, Taesoo, Hyungyu, Saelyne, Yoonjoo, Yeon Su, Hyoungwook, and Bekzat!',
+  },
+  {
+    title: 'CoE Ph.D. Dissertation Award',
+    date: new Date('2026-01-28'),
+    categories: ['award'],
+    summary:
+      'Taesoo received the College of Engineering Ph.D. Dissertation Award for his dissertation, “Disentangling Text for Interactive AI Alignment.” Congratulations!',
+  },
   {
     title: 'A paper accepted to IUI 2026',
     date: new Date('2025-12-14'),
@@ -132,13 +153,7 @@ export const POSTS: Post[] = [
     summary:
       'Our paper "Can Fans Build Parasocial Relationships through Idols’ Simulated Voice Messages?: A Study of AI Private Call Users’ Perceptions, Cognitions, and Behaviors." led by Eun Jeong has been accepted to [CSCW 2025](https://cscw.acm.org/2025/). Congratulations!',
   },
-  {
-    title: 'Seoyoung Awarded Outstanding Ph.D Thesis Award from KAIST School of Computing!',
-    date: new Date('2025-02-11'),
-    categories: ['award'],
-    summary:
-      'Seoyoung Kim was awarded the prestigious Outstanding Ph.D Thesis Award from the KAIST School of Computing.',
-  },
+
   {
     title: 'Seoyoung successfully defended his Ph.D. thesis',
     date: new Date('2024-12-02'),