fix(ui): display correct project names in session stats

Replace session.projectPath.split('/').pop() with getProjectDisplayName()
to ensure the actual leaf folder name is shown instead of incorrect fragments.

Example fixes:
- /home/user/projects/my-app now shows "my-app" instead of "app"
- /home/user/workspaces/repo-name/worktrees/feature-branch now shows "feature-branch" instead of "branch"

Addresses potential issues with project name display in analytics dashboard.

Related to: #348 (quota display), #103 (context display)

bun.lock

@@ -1,5 +1,6 @@
 {
   "lockfileVersion": 1,
+  "configVersion": 0,
   "workspaces": {
     "": {
       "name": "@kaitranntt/ccs",

ui/bun.lock

@@ -1,5 +1,6 @@
 {
   "lockfileVersion": 1,
+  "configVersion": 0,
   "workspaces": {
     "": {
       "name": "ui",