Add authN token refresh

[kislerdm]

What changed

Client

• Added token refresh logic in the client
• Fixed authN when triggering generation using keyboard's key combination (ctr+enter)

Server

• Adjusted response status code and error msg

Why do we need it

• UX improvement

[codecov[bot]]

Codecov Report

Merging #73 (524bdfc) into master (1d54615) will increase coverage by 0.71%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
+ Coverage   74.74%   75.46%   +0.71%     
==========================================
  Files          23       24       +1     
  Lines        2257     2323      +66     
==========================================
+ Hits         1687     1753      +66     
  Misses        452      452              
  Partials      118      118              

Flag	Coverage Δ
cmd-httpserver	∅ <ø> (∅)
pkg-gcpsecretsmanager	77.35% <ø> (ø)
pkg-httpclient	100.00% <ø> (?)
pkg-openai	89.62% <ø> (ø)
pkg-postgres	78.60% <ø> (ø)
root	71.51% <100.00%> (ø)

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Files Changed	Coverage Δ
server/core/ciam/httphandler.go	50.93% <100.00%> (ø)

... and 1 file with indirect coverage changes

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