[paymentsheet-example] Search box to filter settings in Playground

[lng-stripe]

Summary

Adds a search box to the top of Playground to more quickly find settings within the ever-growing list.

Motivation

Make it easier to access frequently used settings.

Testing

• Added tests
• Modified tests
• Manually verified

Screenshots

Screen.Recording.2025-06-02.at.3.22.58.PM-compressed.mov

[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 │   2.1 MiB │   2.1 MiB │  0 B │   4.3 MiB │   4.3 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 │ 302.9 KiB │ 302.9 KiB │  0 B │   457 KiB │   457 KiB │  0 B 
   native │   6.2 MiB │   6.2 MiB │  0 B │  15.8 MiB │  15.8 MiB │  0 B 
    asset │   7.7 KiB │   7.7 KiB │  0 B │   7.4 KiB │   7.4 KiB │  0 B 
    other │  95.7 KiB │  95.7 KiB │ +4 B │ 183.5 KiB │ 183.5 KiB │  0 B 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
    total │   9.8 MiB │   9.8 MiB │ +4 B │  21.8 MiB │  21.8 MiB │  0 B 

 DEX     │ old   │ new   │ diff      
─────────┼───────┼───────┼───────────
   files │     1 │     1 │ 0         
 strings │ 20669 │ 20669 │ 0 (+0 -0) 
   types │  6496 │  6496 │ 0 (+0 -0) 
 classes │  5261 │  5261 │ 0 (+0 -0) 
 methods │ 31499 │ 31499 │ 0 (+0 -0) 
  fields │ 18208 │ 18208 │ 0 (+0 -0) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  164 │  164 │  0   
 entries │ 3646 │ 3646 │  0

APK

   compressed    │   uncompressed   │                                           
──────────┬──────┼───────────┬──────┤                                           
 size     │ diff │ size      │ diff │ path                                      
──────────┼──────┼───────────┼──────┼───────────────────────────────────────────
 29.2 KiB │ +4 B │  64.6 KiB │  0 B │ ∆ META-INF/CERT.SF                        
 25.9 KiB │ +3 B │  64.5 KiB │  0 B │ ∆ META-INF/MANIFEST.MF                    
  1.2 KiB │ -2 B │   1.2 KiB │  0 B │ ∆ META-INF/CERT.RSA                       
    270 B │ -1 B │     120 B │  0 B │ ∆ META-INF/version-control-info.textproto 
──────────┼──────┼───────────┼──────┼───────────────────────────────────────────
 56.5 KiB │ +4 B │ 130.5 KiB │  0 B │ (total)