Update title gen loading state

[jeffpaul]

Description

Let's update the loading button style from the existing:

title-gen-loading.mp4

to match our otherwise standard loading state (without the arrow bits inside the button):

Step-by-step reproduction instructions

.

Screenshots, screen recording, code snippet

No response

Environment info

No response

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except the AI plugin.

• Yes

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure

[Takshil-Kunadia]

Hi @jeffpaul I'd like to work on this. Is this ready to pickup.

[jeffpaul]

Yes @Takshil-Kunadia please open a PR, thanks!

[dkotter]

Note there are changes coming to this in #375 so may be worth waiting until that is merged (or punted)