fix: FieldsTo* resolves caret class instead of first class in file

[tangcent]

Problem

Right-clicking inside a data class in the editor (e.g. SalesReportVO declared after AnalyticsController in the same file) and selecting ToJson / ToJson5 / ToProperties formatted the wrong class — the controller, not the data class under the caret.

Root cause

FieldFormatAction.findPsiClass relied on CommonDataKeys.PSI_ELEMENT, which is populated by the Project View, not by the editor context-menu. With PSI_ELEMENT null, resolution fell through to:

PsiTreeUtil.findChildOfType(file, PsiClass::class.java)

which always returns the first top-level class in the file regardless of caret position. Any file with multiple top-level classes (controller + sibling VO/DTO classes, common in sample projects) hit this bug.

Fix

• SelectedHelper.resolveSelection — added a caret-based resolution step (between the PSI_ELEMENT check and the PSI_FILE fallback) that resolves the PSI element at the caret offset and walks up to the nearest PsiMethod/PsiClass. Benefits every caller of SelectedHelper (export actions, field-format actions).
• FieldFormatAction — dropped the bespoke findPsiClass and now uses SelectedHelper.resolveSelection(e)?.psiClass(), matching the convention used by ChannelExportAction/ExportApiAction.

Behavior

Right-clicking inside SalesReportVO (or any VO/DTO class) and choosing ToJson now correctly formats that data class, not AnalyticsController.

Tests

Added 5 cases to SelectedHelperTest covering caret-based resolution in a multi-class file:

Test	Verifies
testResolveSelectionFromCaretInNonFirstClass	Caret in SalesReportVO → resolves SalesReportVO, not AnalyticsController (the regression test for this bug)
testResolveSelectionFromCaretInFirstClass	Caret in the first class still resolves correctly
testResolveSelectionFromCaretInMethodResolvesContainingClass	Caret in a method walks up to its containing class
testResolveSelectionFallsBackToFileWhenCaretResolvesNothing	EOF caret → falls through to PSI_FILE branch (preserves existing behaviour)
testPsiElementTakesPrecedenceOverEditorCaret	PSI_ELEMENT wins over caret (guards documented precedence)

All 21 SelectedHelperTest cases pass.

[github-actions]

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[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.997%. Comparing base (411ee5c) to head (60062ec).

Files with missing lines	Patch %	Lines
...om/itangcent/easyapi/ide/support/SelectedHelper.kt	71.429%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##            master      #727       +/-   ##
=============================================
+ Coverage   63.989%   63.997%   +0.007%     
=============================================
  Files          363       363               
  Lines        20880     20887        +7     
  Branches      5130      5133        +3     
=============================================
+ Hits         13361     13367        +6     
  Misses        5645      5645               
- Partials      1874      1875        +1     

Flag	Coverage Δ
unittests	63.997% <71.429%> (+0.007%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...om/itangcent/easyapi/ide/support/SelectedHelper.kt	50.000% <71.429%> (+2.941%)	⬆️

... and 1 file with indirect coverage changes

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