Add observer project detail page with files, evaluations & reviews

New page at /observer/projects/[projectId] showing project info,
documents grouped by round requirements, and jury evaluations with
click-through to full review details. Dashboard table rows now link
to project detail. Also cleans up redundant programName prefixes
and fixes chart edge cases.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/charts/project-rankings.tsx

@@ -30,13 +30,13 @@ export function ProjectRankingsChart({
   data,
   limit = 20,
 }: ProjectRankingsProps) {
-  if (!data?.length) return null
-
-  const scoredData = data.filter(
+  const scoredData = (data ?? []).filter(
     (d): d is ProjectRankingData & { averageScore: number } =>
       d.averageScore !== null,
   )
 
+  if (!scoredData.length) return null
+
   const averageScore =
     scoredData.length > 0
       ? scoredData.reduce((sum, d) => sum + d.averageScore, 0) /