ui: GitHub-Actions-style detail page, sub-steps, mini-tile run-view

Reshapes the detail page into a run-view: hybrid horizontal pipeline
+ expanded active-step pane with sub-steps, a per-step log pane with
line-numbered permalinks and client-side search, and a runs-history
sidebar that navigates via ?run=N. Default step is server-picked
(running → failed → Reporting) so the operator lands on the thing
that's moving.

Adds a sub_steps table + SSE topic (substep-{run}-{stage}-{ordinal})
so per-disk and per-pass work (SMART, CPUStress CPU/RAM, Storage,
GPU) is visible in the UI instead of buried in stage summary JSON.
Agent emits sub-step reports from existing per-iteration loops.

Dashboard tiles become a mini run-view with a 9-dot step strip so
the operator reads run health across the whole grid at a glance.
Register page gets the same card shell + button styling.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

agent/tests/storage.go

@@ -91,12 +91,35 @@ func Storage(ctx context.Context, d Deps) Outcome {
 
 	// Per target: short badblocks write sample + fio random-read/write.
 	var samples []Sample
+	var subs []SubStepReport
 	perDisk := map[string]any{}
 	for _, t := range targets {
 		d.Info("Storage: running badblocks write sample on " + t.Device)
+		bbStart := time.Now()
 		bb := runBadblocks(ctx, t.Device)
+		bbEnd := time.Now()
+		bbSummary, _ := json.Marshal(bb)
+		subs = append(subs, SubStepReport{
+			Name:        fmt.Sprintf("badblocks %s", t.Device),
+			Passed:      bb.OK,
+			StartedAt:   bbStart,
+			CompletedAt: bbEnd,
+			SummaryJSON: bbSummary,
+		})
+
 		d.Info(fmt.Sprintf("Storage: running fio random rw on %s", t.Device))
+		fioStart := time.Now()
 		fr := runFio(ctx, t.Device)
+		fioEnd := time.Now()
+		fioSummary, _ := json.Marshal(fr)
+		subs = append(subs, SubStepReport{
+			Name:        fmt.Sprintf("fio %s", t.Device),
+			Passed:      fr.Error == "",
+			StartedAt:   fioStart,
+			CompletedAt: fioEnd,
+			SummaryJSON: fioSummary,
+		})
+
 		perDisk[t.Device] = map[string]any{
 			"badblocks": bb,
 			"fio":       fr,
@@ -107,10 +130,11 @@ func Storage(ctx context.Context, d Deps) Outcome {
 		)
 		if !bb.OK {
 			return Outcome{
-				Passed:  false,
-				Message: "badblocks found errors on " + t.Device,
-				Summary: "badblocks failed on " + t.Device,
-				Extras:  map[string]any{"per_disk": perDisk, "wipe_probe": probes},
+				Passed:   false,
+				Message:  "badblocks found errors on " + t.Device,
+				Summary:  "badblocks failed on " + t.Device,
+				Extras:   map[string]any{"per_disk": perDisk, "wipe_probe": probes},
+				SubSteps: subs,
 			}
 		}
 	}
@@ -120,9 +144,10 @@ func Storage(ctx context.Context, d Deps) Outcome {
 
 	d.Info(fmt.Sprintf("Storage: %d disk(s) passed badblocks + fio", len(targets)))
 	return Outcome{
-		Passed:  true,
-		Summary: fmt.Sprintf("%d disks passed", len(targets)),
-		Extras:  map[string]any{"per_disk": perDisk, "wipe_probe": probes},
+		Passed:   true,
+		Summary:  fmt.Sprintf("%d disks passed", len(targets)),
+		Extras:   map[string]any{"per_disk": perDisk, "wipe_probe": probes},
+		SubSteps: subs,
 	}
 }