[Bug] Kanban Board Tasks Are Empty Without Internet

### Bug Description

When using AppFlowy on a Linux Mint desktop without an active internet connection, any tasks pre-created within the Kanban Board appear empty. This issue disrupts offline work.

### How to Reproduce

- Disconnect the Linux Mint desktop from the internet.
- Close and Re-Open the AppFlowy app (if already opened).
- Check the existing task created previously before the app was closed.

### Expected Behavior

- Tasks previously created in the Kanban Board should be cached locally.
- Users should be able to view the existing task after opening the application.

### Operating System

Linux Mint

### AppFlowy Version(s)

0.7.5

### Screenshots


### Additional Context

OS: Linux Mint 22 x86_64
Host: Latitude E7470
Kernel: 6.8.0-51-generic
Uptime: 26 mins
Packages: 2692 (dpkg), 21 (flatpak)
Shell: bash 5.2.21
Resolution: 1920x1080
DE: Cinnamon 6.2.9
WM: Mutter (Muffin)
WM Theme: Mint-Y-Dark-Orange (Mint-Y)
Theme: Mint-Y-Orange [GTK2/3]
Icons: Mint-Y-Yaru [GTK2/3]
Terminal: gnome-terminal
CPU: Intel i5-6300U (4) @ 3.000GHz
GPU: Intel Skylake GT2 [HD Graphics 520]
Memory: 2679MiB / 11637MiB