Guard against failures to access clipboard

[allanlasser]

Fixes #937

• Refactors clipboard access into tested utility function

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	30.89%	6776 / 21933
🔵	Statements	30.89%	6776 / 21933
🔵	Functions	49.11%	276 / 562
🔵	Branches	75.01%	1021 / 1361

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
src/lib/components/documents/Share.svelte	100%	62.96%	57.14%	100%
src/lib/components/projects/ProjectShare.svelte	0%	0%	0%	0%	1-101
src/lib/utils/copy.ts	100%	100%	100%	100%
src/lib/utils/tests/copy.test.ts	100%	100%	100%	100%

Generated in workflow #440 for commit 8000f99 by the Vitest Coverage Report Action