fix(import): make JSONImportPluginTests link

[datlechin]

Fixes the pre-existing macOS App Tests failure on main (introduced with #1536 and merged red).

Problem

JSONImportPluginTests did @testable import JSONImport and called the plugin's static methods. JSONImport builds as a loadable .tableplugin (wrapper.cfbundle), whose symbols a test target cannot link, so every JSONImportPlugin.* reference was an undefined symbol at link time and macOS App Tests failed. No other plugin test imports a plugin module this way.

Fix

• Extract the pure parsing / row-extraction / field-inference logic into JSONImportParsing (a plain enum, no SwiftUI or bundle surface).
• JSONImportPlugin delegates to it; behavior unchanged.
• The test calls JSONImportParsing.* and drops @testable import JSONImport.
• A membershipExceptions set compiles JSONImportParsing.swift into TableProTests too (same mechanism mcp-server uses to share TablePro/ sources), so the test links its own copy instead of the loadable bundle.

Verification

xcodebuild test -only-testing:TableProTests/JSONImportPluginTests passes locally (previously failed to link). All assertions unchanged.

[chatgpt-codex-connector]

💡 Codex Review

TablePro/TablePro.xcodeproj/project.pbxproj

Line 504 in 549a36f

JSONImportParsing.swift,

Add the parsing file to the test target instead of excluding it

When building TableProTests, this synchronized-folder setting does not make JSONImportParsing.swift available to the test target: membershipExceptions are the files excluded from the target (the existing plugin entries use the same field to exclude Info.plist). Since the tests now reference JSONImportParsing directly and no longer import JSONImport, the test target will fail to compile with Cannot find 'JSONImportParsing' in scope unless this source file is actually added as a target member.

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