Add document viewer with proper 404 handling for trust center

Move document download/view to a dedicated viewer page with PDF preview,
access request flow, and a proper 404 error boundary when documents are
not found. The backend now returns NOT_FOUND instead of INTERNAL for
missing documents and reports.

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

.github/workflows/make.yaml

@@ -153,8 +153,6 @@ jobs:
           name: "build-artifacts"
       - run: "chmod +x bin/probod"
       - run: "make generate"
-      - run: "make go-fmt"
-      - run: "make go-fix"
       - name: "Run go vet"
         run: "go vet ./..."
       - name: "Run golangci-lint"