perf(IT-Wallet): [SIW-000] Improve proximity QR code screen performance

[mastro993]

Short description

Reduce hitching when opening the IT Wallet proximity QR code screen, while still rendering the QR with react-native-qrcode-skia.

List of changes proposed in this pull request

• Defer mounting react-native-qrcode-skia until after the skeleton has painted, so SVG path generation does not block the first frame
• Memoize QR props (shapeOptions, logo, size) so the path is built once instead of on every parent re-render
• Keep a fixed-size QR slot so the branded box does not jump between skeleton and QR
• Set max brightness immediately on the presentment screen (no 1.5s JS brightness ramp)
• Add a regression test that skeleton and QR share the same slot size

How to test

1. Open the wallet home with presentable credentials
2. Tap Avvia verifica
3. Confirm the QR screen opens without flicker: skeleton stays until the QR is ready, then the Skia QR appears
4. Confirm the QR still scans and the IT Wallet logo is in the center
5. Open the screen twice and confirm the second open does not rebuild the path on unrelated re-renders
6. Optional: React DevTools profiler on the open
   • String-arrival commit should stay cheap (~1ms)
   • QRCode first mount still does the library's SVG path work (~120ms), isolated after the skeleton paint

[github-actions]

Jira Pull Request Link

This Pull Request refers to Jira issues:

• SIW-000

[github-actions]

PR Title Validation for conventional commit type

✅ All good! PR title follows the conventional commit type.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.38%. Comparing base (d2bf379) to head (ae68b08).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8530      +/-   ##
==========================================
- Coverage   64.39%   64.38%   -0.02%     
==========================================
  Files        1996     1996              
  Lines       38129    38147      +18     
  Branches     6458     6461       +3     
==========================================
+ Hits        24553    24560       +7     
- Misses      12155    12167      +12     
+ Partials     1421     1420       -1     

Files with missing lines	Coverage Δ
...n/proximity/components/ItwProximityQrCodeImage.tsx	93.18% <100.00%> (+4.72%)	⬆️
...roximity/screens/ItwProximityPresentmentScreen.tsx	83.87% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[ale-mazz]

@mastro993 I honestly see a worse situation here.

• Flickers
• The transition animation is gone
• The screen brightness is creating a strange effect with a re-render of the whole screen

IMG_0066.MP4