Two related fixes surfaced by armandoescalante in #915 when clicking a
Content Explorer category card (e.g. Medicine) on v1.32.0-rc.6:
1. TierSelectionModal placed a useMemo for freeBytes *after* the
`if (!category) return null` early return (introduced in PR #901's
guardrail integration). When `category` transitioned from null to
non-null on first open, React saw a different hook count between
renders and crashed the entire component tree with "Rendered more
hooks than during the previous render", blanking the modal. Moved
the freeBytes useMemo above the early return so hook order is
constant.
2. `IconLibrary` was used as the icon prop on the Manage Custom
Libraries button in remote-explorer.tsx but never registered in
the DynamicIcon allowlist at admin/inertia/lib/icons.ts. Added it
to both the import block and the icons map so the warning stops
firing and the icon renders.
Closes#915.
6e5284e563