fix(cli): wrap long material annotation values in describe output

Cosign signature annotations on container materials carry ~1200-char
base64 blobs that ballooned the Materials table column width to several
times the terminal width. Wrap to 100 chars like the existing container
image Value field does.

Assisted-by: Claude Code
Signed-off-by: Miguel Martinez Trivino <miguel@chainloop.dev>

Chainloop-Trace-Sessions: 5bd2a917-fb7b-400c-9772-60ba6af6c9af, b66717f5-626e-4c20-8d33-59c129b5885d

Author: migmartri

app/cli/cmd/workflow_workflow_run_describe.go

@@ -221,7 +221,7 @@ func predicateV1Table(att *action.WorkflowRunAttestationItem) {
 			if len(m.Annotations) > 0 {
 				mt.AppendRow(table.Row{"Annotations", "------"})
 				for _, a := range m.Annotations {
-					mt.AppendRow(table.Row{"", fmt.Sprintf("%s: %s", a.Name, a.Value)})
+					mt.AppendRow(table.Row{"", wrap.String(fmt.Sprintf("%s: %s", a.Name, a.Value), 100)})
 				}
 			}
 			evs := att.PolicyEvaluations[m.Name]