fix: show error toast when deep-link repo fails to load (#1003)

[Xenon010101]

Description\nShows an error toast notification when a deep-linked repo (via `?repo=` param) fails to load, instead of silently clearing the param.\n\n## Changes\n- Imported `toast` from the UI toast component\n- Added `toast.error()` call when the deep-link query fails\n\nCloses #1003

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• client/src/module/student/opensource/RepoDiscoveryPage.tsx

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