Check that we're in the browser before calling searchWithin

[eyeseast]

Was getting a warning about eagerly calling fetch.

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Lighthouse	1 paths audited Performance: 22 (🔴 down 28 from production) Accessibility: 87 (🟢 up 1 from production) Best Practices: 83 (🔴 down 9 from production) SEO: 83 (no change from production) PWA: - View the detailed breakdown and full score reports

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	31.84%	7674 / 24098
🔵	Statements	31.84%	7674 / 24098
🔵	Functions	47.74%	339 / 710
🔵	Branches	75.71%	1113 / 1470

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
src/lib/components/viewer/PaginationToolbar.svelte	0%	0%	0%	0%	1-1810
src/lib/components/viewer/Search.svelte	0%	0%	0%	0%	1-91

Generated in workflow #528 for commit 813d2ed by the Vitest Coverage Report Action