feat: realtime updates for study spaces and reports

src/lib/components/Report.svelte

@@ -29,6 +29,12 @@
             .select()
             .single();
 
+        await supabase.channel("report_updates").send({
+            type: "broadcast",
+            event: "reports_updated",
+            payload: { study_space_id: studySpaceId }
+        });
+
         if (reportUploadError)
             return alert(`Error submitting report: ${reportUploadError.message}`);
         else alert("Report submitted successfully!");