Refactor entity count formatting to support translations

[kmcginnes]

Description

This PR refactors entity count formatting from a static utility function into a custom hook that properly integrates with the translation system, enabling query-language-specific terminology.

New Hook: useEntityCountFormatter

Created a new hook that replaces the static formatEntityCounts utility with translation-aware formatting:

• useFormattedEntityCounts(vertexCount, edgeCount) - Direct formatting hook for use in components
• useEntityCountFormatterCallback() - Returns a callback function for use in mutations and async operations

Key improvements:

• Integrates with the translation system to use query-language-specific terms (e.g., "relationships" for openCypher, "predicates" for SPARQL)
• Maintains locale-aware number formatting (e.g., "1,000 nodes")
• Handles singular/plural forms correctly
• Comprehensive test coverage with 89 lines of tests

Updated Components

• GraphViewerEmptyState - Now uses useFormattedEntityCounts hook
• ImportGraphButton - Now uses useEntityCountFormatterCallback for mutation callbacks
• useRestoreGraphSession - Now uses useEntityCountFormatterCallback for mutation callbacks

This change ensures that entity count messages throughout the application respect the active query language's terminology.

Validation

Gremlin

Cypher

SPARQL

Related Issues

• Part of Update UI labels to be more consistent to the query language #1471

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.

[codecov]

Codecov Report

❌ Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.78%. Comparing base (c5affc5) to head (46ce015).
⚠️ Report is 42 commits behind head on main.

Files with missing lines	Patch %	Lines
...ateProvider/graphSession/useRestoreGraphSession.ts	0.00%	0 Missing and 1 partial ⚠️
...orer/src/modules/GraphViewer/ImportGraphButton.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1477       +/-   ##
===========================================
+ Coverage   47.81%   62.78%   +14.97%     
===========================================
  Files         382      315       -67     
  Lines        8525     6530     -1995     
  Branches     3159     2271      -888     
===========================================
+ Hits         4076     4100       +24     
+ Misses       3070     1699     -1371     
+ Partials     1379      731      -648     

Flag	Coverage Δ
unittests	62.78% <84.61%> (+14.97%)	⬆️

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