feat(export): add branch-coverage tests for export-view.tsx

[d-oit]

Branch Coverage: export-view.tsx (25% → ~60% branches)

What

13 targeted tests covering key branches in the export-view.tsx component.

Coverage Areas

Area	Tests
Entity/claim counts	1 entity, empty store
Reset confirm dialog	open via button, close via Escape, confirm calls handleReset
Section rendering	format grid, dropzone, backup tips
Wiring	setView passed to format grid, dropzone click
Import preview dialog	closed by default

[vercel]

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Project	Deployment	Actions	Updated (UTC)
do-knowledge-studio	Ready	Preview, v0	Jul 31, 2026 8:34am

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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