feat: cleanup header; show user name and opt login in user dropdown

[markphelps]

Fixes: #2222

• Makes storage icon larger if in readonly mode
• Titlecase storage backend if in readonly mode (on hover)
• Puts small ring around user profile pic (if present)
• Shows user's profile name and preferred_username (login) if provided by OIDC/GitHub (see: https://openid.net/specs/openid-connect-basic-1_0.html#StandardClaims)

Note: I put the UI in ReadOnly mode to show the updated icon size/description as well as the spacing between user profile image and if readonly pill

@WDaan lmk if this is what you had in mind and I can mark it as closing the above linked issue ☝🏻

[github-actions]

Uffizzi Ephemeral Environment deployment-42037

☁️ https://app.uffizzi.com/github.com/flipt-io/flipt/pull/2480

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[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (278c1bb) 70.73% compared to head (2f908f3) 70.71%.

Files	Patch %	Lines
internal/server/auth/method/github/server.go	25.00%	2 Missing and 1 partial ⚠️
internal/server/auth/method/oidc/server.go	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2480      +/-   ##
==========================================
- Coverage   70.73%   70.71%   -0.03%     
==========================================
  Files          81       81              
  Lines        8130     8134       +4     
==========================================
+ Hits         5751     5752       +1     
- Misses       2033     2035       +2     
- Partials      346      347       +1     

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[WDaan]

Jup, that's exactly it. Looks way cleaner now! 😎

[erka]

@markphelps I am sorry to be a bit later. It took some time to get dex running in local env. There is a small issue if scopes have the email option only. The UI will look like this.

[markphelps]

Good catch @erka , will fix!