Add node and edge styling sidebar panels to Schema Explorer

[kmcginnes]

Description

Add node and edge styling tabs to the Schema Explorer sidebar, allowing users to customize vertex and edge type display labels and styles directly from the schema view.

• Add SchemaNodesStyling panel reusing SingleNodeStyling with virtualized list
• Add SchemaEdgesStyling panel reusing SingleEdgeStyling with virtualized list
• Extend SchemaExplorerSidebar from a single details tab to three tabs (details, node styling, edge styling)
• Add NodeStyleDialog and EdgeStyleDialog to the Schema Explorer route so the "Customize" buttons work
• Add tests for the sidebar tab rendering and tab switching behavior

Validation

• Open Schema Explorer with a connected database that has schema data
• Verify three tabs appear in the sidebar: details, node styling, edge styling
• Click each tab and confirm the correct content renders
• Change a display label and verify it persists
• Click "Customize" and verify the style dialog opens
• Run pnpm checks and pnpm test to confirm no regressions

Node Styles	Edge Styles

Related Issues

• Resolves Allow customizing the style from schema visualization #1378

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.77%. Comparing base (c5affc5) to head (5084862).
⚠️ Report is 74 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1540       +/-   ##
===========================================
+ Coverage   47.81%   64.77%   +16.96%     
===========================================
  Files         382      365       -17     
  Lines        8525     8299      -226     
  Branches     3159     3100       -59     
===========================================
+ Hits         4076     5376     +1300     
+ Misses       3070     2074      -996     
+ Partials     1379      849      -530     

Flag	Coverage Δ
unittests	64.77% <100.00%> (+16.96%)	⬆️

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