refine(dashboard): layout and loading indicator

[shhdgit]

I hereby agree to the terms of the Singularity Data, Inc. Contributor License Agreement.

What's changed and what's your intention?

• Fix page flashing caused by loading wrapper.
• Add layout title and fix nav item animation

From:

To:

Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in ./risedev check (or alias, ./risedev c)

Refer to a related PR or issue link (optional)

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #3455 (3a3d751) into main (91a6990) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3455      +/-   ##
==========================================
- Coverage   74.27%   74.27%   -0.01%     
==========================================
  Files         768      768              
  Lines      106623   106623              
==========================================
- Hits        79196    79193       -3     
- Misses      27427    27430       +3     

Flag	Coverage Δ
rust	74.27% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/meta/src/hummock/mock_hummock_meta_client.rs	40.56% <0.00%> (-0.95%)	⬇️
src/frontend/src/expr/utils.rs	98.99% <0.00%> (-0.26%)	⬇️
src/storage/src/hummock/local_version_manager.rs	84.37% <0.00%> (-0.16%)	⬇️
src/meta/src/manager/id.rs	95.50% <0.00%> (ø)

📣 Codecov can now indicate which changes are the most critical in Pull Requests. Learn more

[mikechesterwang]

LGTM!