Fix commits tab + add CI job logs; bump to 1.7

Commits tab was empty: Gitea PR commits have no 'id' field (only sha), but
PRCommit.id was a non-optional let decoded from 'id', so decoding [PRCommit]
always threw and the tab silently showed nothing. Make PRCommit.id a computed
sha-based identity so the array decodes and renders.

CI: add a Logs button per job that fetches the job's raw log text
(/actions/jobs/{id}/logs) into a viewable, shareable screen. Bump to 1.7.

GiteaPR/Detail/Tabs.swift

@@ -218,6 +218,14 @@ struct ChecksTab: View {
                             .font(.caption)
                             .buttonStyle(.bordered)
                         }
+                        NavigationLink {
+                            JobLogsView(repo: vm.repo, runID: run.id, jobID: job.id,
+                                        jobName: job.name)
+                        } label: {
+                            Text("Logs")
+                                .font(.caption)
+                        }
+                        .buttonStyle(.bordered)
                     }
                 }
             }