fix: use auth singleton in library/liked pages after layout simplification (#782)
After PR #781 simplified +layout.ts to no longer provide isAuthenticated
in layout data, pages using `await parent()` to check auth were broken
(isAuthenticated was undefined, always redirecting to /).
Changed library/+page.ts and liked/+page.ts to use the auth singleton
directly via `await auth.initialize()` - consistent with how +layout.svelte
now handles auth.
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