[Connect] Default to using the first account if no account is selected

[simond-stripe]

Summary

To make things easier for testing, if you haven't selected an account you should get the first account in the EmbeddedComponents

Motivation

This makes the example app easier to use and test

Testing

• Added tests
• Modified tests
• Manually verified

Screenshots

After

demo-1734112279.mp4

Before

demo-1734112581.mp4

[github-actions]

Diffuse output:

OLD: identity-example-release-base.apk (signature: V1, V2)
NEW: identity-example-release-pr.apk (signature: V1, V2)

          │          compressed           │         uncompressed         
          ├───────────┬───────────┬───────┼───────────┬───────────┬──────
 APK      │ old       │ new       │ diff  │ old       │ new       │ diff 
──────────┼───────────┼───────────┼───────┼───────────┼───────────┼──────
      dex │     2 MiB │     2 MiB │   0 B │   4.1 MiB │   4.1 MiB │  0 B 
     arsc │     1 MiB │     1 MiB │   0 B │     1 MiB │     1 MiB │  0 B 
 manifest │   2.3 KiB │   2.3 KiB │   0 B │     8 KiB │     8 KiB │  0 B 
      res │ 301.8 KiB │ 301.8 KiB │   0 B │ 455.5 KiB │ 455.5 KiB │  0 B 
   native │   6.2 MiB │   6.2 MiB │   0 B │  15.8 MiB │  15.8 MiB │  0 B 
    asset │   7.1 KiB │   7.1 KiB │   0 B │   6.9 KiB │   6.9 KiB │  0 B 
    other │  90.3 KiB │  90.2 KiB │ -11 B │ 170.3 KiB │ 170.3 KiB │  0 B 
──────────┼───────────┼───────────┼───────┼───────────┼───────────┼──────
    total │   9.6 MiB │   9.6 MiB │ -11 B │  21.5 MiB │  21.5 MiB │  0 B 

 DEX     │ old   │ new   │ diff      
─────────┼───────┼───────┼───────────
   files │     1 │     1 │ 0         
 strings │ 19966 │ 19966 │ 0 (+0 -0) 
   types │  6188 │  6188 │ 0 (+0 -0) 
 classes │  4979 │  4979 │ 0 (+0 -0) 
 methods │ 29759 │ 29759 │ 0 (+0 -0) 
  fields │ 17526 │ 17526 │ 0 (+0 -0) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  164 │  164 │  0   
 entries │ 3622 │ 3622 │  0

APK

    compressed    │  uncompressed   │                                           
──────────┬───────┼──────────┬──────┤                                           
 size     │ diff  │ size     │ diff │ path                                      
──────────┼───────┼──────────┼──────┼───────────────────────────────────────────
 28.5 KiB │  -7 B │ 62.9 KiB │  0 B │ ∆ META-INF/CERT.SF                        
    270 B │  -2 B │    120 B │  0 B │ ∆ META-INF/version-control-info.textproto 
  1.2 KiB │  -2 B │  1.2 KiB │  0 B │ ∆ META-INF/CERT.RSA                       
──────────┼───────┼──────────┼──────┼───────────────────────────────────────────
 29.9 KiB │ -11 B │ 64.2 KiB │  0 B │ (total)