Add New TextViewer

[Copilot]

Description

Two improvements to text file handling in the UI:

1. TextFileViewer (the performant ListView-based viewer) now guards against auto-loading files >500 MB — showing a warning overlay with the explicit file size and a confirmation button instead of freezing the UI.
2. TextViewer (the workspace viewer panel) was reimplemented on top of TextFileViewer instead of a raw ScrollView+TextArea, which had an effective ~50 MB load limit and none of the performance or UX features of TextFileViewer.

Features list

• Files ≤500 MB load normally in TextFileViewer, including files previously blocked by the ~50 MB limit.
• Files >500 MB display a centered warning overlay with the explicit size and a "Load File (X MB/GB)" confirmation button; no XHR load is attempted until confirmed.
• TextViewer.qml now delegates all file loading and display to TextFileViewer, gaining: line-by-line rendering, built-in reload/scroll/copy toolbar, and the large-file guard above.
• Top file-path bar in TextViewer (path display + copy-to-clipboard) is preserved.

Implementation remarks

TextFileViewer.qml

• Added largeFileWarning, largeFileSizeMB, largeFileSizeStr (computed once), and confirmLargeLoad properties.
• loadSource() checks Filepath.fileSizeMB(source) before issuing the XHR; if >500 MB and not yet confirmed, it shows the warning and returns early.
• XHR logic extracted to _performLoad(), called after the size check passes or after the user confirms.
• confirmLargeLoad resets on every source change so each new file gets a fresh check.

TextViewer.qml

• Removed: fileContent, loading, load(), onSourceChanged, ScrollView+TextArea, BusyIndicator, placeholder label, and the redundant "Open Externally" toolbar button (already in TextFileViewer's sidebar).
• Replaced the entire content area with TextFileViewer { source: root.source }.
• Result is ~70 fewer lines; TextViewer is now a thin wrapper that adds only the top file-path context bar.

Original prompt

Create a new TextViewer, similar to the ImageViewer but for text files like .txt, .json, ... When we double click on a node with a text file in output display the text file in the new TextViewer.

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[codecov]

Codecov Report

❌ Patch coverage is 96.29630% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.09%. Comparing base (4dbae70) to head (403247a).
⚠️ Report is 31 commits behind head on develop.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
meshroom/core/node.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3036      +/-   ##
===========================================
+ Coverage    83.07%   83.09%   +0.01%     
===========================================
  Files           72       72              
  Lines         9657     9684      +27     
===========================================
+ Hits          8023     8047      +24     
- Misses        1634     1637       +3     

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