fix: [IEL-56] Pdf flashing during sign

[freddi301]

Short description

This PR addresses a graphical glitch happening when viewing pdf documents to sign.
It happens when changing screen. There three variations of this:

• viewing the document for the first time a white blink happens
• viewing a subsequent document shows the old one for a split second
• viewing clauses if affected by the same

After a thorough investigation we discovered that it was due to downloadUrl pot contains previous document url when viewwing the affected screens.
Affected components:

• FciDocumentsScreen.tsx
• DocumentWithSignature.tsx
• DocumentViewer.tsx

In the end we decided to fix only one occurrence, since there weren't issue reported from users:

• FciDocumentsScreen.tsx when doing from document one to docuement two

We left unsolved the other:

• flashing, first and subsequent when viewing specific caluses trough DocumentWithSignature.tsx
• flashing, first and subsequent when viewing with DocumentViewer.tsx

List of changes proposed in this pull request

• reset document downloadUrl pot when FciDocumentsScreen.tsx loses focus

How to test

• start signing process
• view first document
• view second document
• when viewing second document the previous document is not shown for a splitsecond

before.mp4

after.mp4

[github-actions]

Jira Pull Request Link

This Pull Request refers to Jira issues:

• IEL-56

[github-actions]

PR Title Validation for conventional commit type

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

[freddi301]

for investigation purposes, this commit 7c15d18 hides wiht opacity 0 the pdf component instance while loading. This may indicated that the problem might be that old previous content is shown while loading the most recent one.
Not all instances of the problem are solved and other solution must be found.
The file is FciDocumentsScreen.tsx, also the fix should be replicated onto DocumentWithSignature.tsx

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 60.58%. Comparing base (12d85cb) to head (bbe701e).

Files with missing lines	Patch %	Lines
.../features/fci/screens/valid/FciDocumentsScreen.tsx	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7857      +/-   ##
==========================================
- Coverage   60.58%   60.58%   -0.01%     
==========================================
  Files        1947     1947              
  Lines       43016    43018       +2     
  Branches     9872     9871       -1     
==========================================
+ Hits        26063    26064       +1     
- Misses      16874    16876       +2     
+ Partials       79       78       -1     

Files with missing lines	Coverage Δ
.../features/fci/screens/valid/FciDocumentsScreen.tsx	63.21% <50.00%> (-0.32%)	⬇️

... and 1 file with indirect coverage changes

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[Copilot]

Pull request overview

This PR mitigates a PDF “flashing” glitch in the FCI signing flow by ensuring the previously downloaded preview path isn’t reused when returning to the documents screen (the screen stays mounted across navigation changes).

Changes:

• Clear the fciDownloadPreview pot when FciDocumentsScreen loses focus.
• Keep existing focus-triggered download behavior for the currently selected document.

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