fix(web): close run phase on terminal events (#427)

Run Events no longer leaves the pre-execution Initializing bar open when
a run fails before `run.running`. This addresses the waterfall symptom
in fabro-sh/fabro#426.

The phase derivation now records terminal `run.completed` / `run.failed`
events and uses them as fallback boundaries for Submitted, Pending,
Runnable, and Initializing phases. The existing `run.running` handoff
still takes precedence once execution actually starts.

Tested:
- `cd apps/fabro-web && bun test app/lib/run-phases.test.ts`
- `cd apps/fabro-web && bun run typecheck`
- `git diff --check`

---

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apps/fabro-web/app/lib/run-phases.test.ts

@@ -9,6 +9,7 @@ const T_PENDING = "2026-05-23T12:00:02.000Z";
 const T_RUNNABLE = "2026-05-23T12:00:03.000Z";
 const T_STARTING = "2026-05-23T12:00:04.000Z";
 const T_RUNNING = "2026-05-23T12:00:10.000Z";
+const T_FAILED = "2026-05-23T12:00:12.000Z";
 
 function makeEvent(name: string, ts: string, seq: number): EventEnvelope {
   return {
@@ -114,6 +115,38 @@ describe("deriveRunPhases", () => {
     expect(phases[1]!.endMs).toBe(Date.parse(T_RUNNING));
   });
 
+  test("closes initializing at run.failed when the run never reaches running", () => {
+    const phases = deriveRunPhases(
+      [
+        makeEvent("run.start_requested", T_REQUESTED, 1),
+        makeEvent("run.runnable", T_RUNNABLE, 2),
+        makeEvent("run.starting", T_STARTING, 3),
+        makeEvent("run.failed", T_FAILED, 4),
+      ],
+      CREATED,
+    );
+    expect(phases).toEqual([
+      {
+        kind: "submitted",
+        label: "Submitted",
+        startMs: Date.parse(CREATED),
+        endMs: Date.parse(T_REQUESTED),
+      },
+      {
+        kind: "runnable",
+        label: "Runnable",
+        startMs: Date.parse(T_RUNNABLE),
+        endMs: Date.parse(T_STARTING),
+      },
+      {
+        kind: "initializing",
+        label: "Initializing",
+        startMs: Date.parse(T_STARTING),
+        endMs: Date.parse(T_FAILED),
+      },
+    ]);
+  });
+
   test("uses run.starting as fallback end for submitted when pre-execution events are missing", () => {
     const phases = deriveRunPhases(
       [makeEvent("run.starting", T_STARTING, 1)],

apps/fabro-web/app/lib/run-phases.ts

@@ -29,11 +29,12 @@ export function deriveRunPhases(
   let runnableMs: number | null = null;
   let startingMs: number | null = null;
   let runningMs: number | null = null;
-  let remaining = 5;
+  let terminalMs: number | null = null;
+  let remaining = 6;
 
   for (const event of events ?? []) {
     if (remaining === 0) break;
-    let target: "startRequested" | "pending" | "runnable" | "starting" | "running" | null = null;
+    let target: "startRequested" | "pending" | "runnable" | "starting" | "running" | "terminal" | null = null;
     switch (event.event) {
       case "run.start_requested":
         if (startRequestedMs == null) target = "startRequested";
@@ -50,6 +51,10 @@ export function deriveRunPhases(
       case "run.running":
         if (runningMs == null) target = "running";
         break;
+      case "run.completed":
+      case "run.failed":
+        if (terminalMs == null) target = "terminal";
+        break;
     }
     if (target == null) continue;
     const ms = Date.parse(event.ts);
@@ -60,6 +65,7 @@ export function deriveRunPhases(
       case "runnable": runnableMs = ms; break;
       case "starting": startingMs = ms; break;
       case "running": runningMs = ms; break;
+      case "terminal": terminalMs = ms; break;
     }
     remaining -= 1;
   }
@@ -70,7 +76,7 @@ export function deriveRunPhases(
     kind: "submitted",
     label: PHASE_LABEL.submitted,
     startMs: createdMs,
-    endMs: startRequestedMs ?? pendingMs ?? runnableMs ?? startingMs ?? runningMs,
+    endMs: startRequestedMs ?? pendingMs ?? runnableMs ?? startingMs ?? runningMs ?? terminalMs,
   });
 
   if (pendingMs != null) {
@@ -78,7 +84,7 @@ export function deriveRunPhases(
       kind: "pending",
       label: PHASE_LABEL.pending,
       startMs: pendingMs,
-      endMs: runnableMs ?? startingMs ?? runningMs,
+      endMs: runnableMs ?? startingMs ?? runningMs ?? terminalMs,
     });
   }
 
@@ -87,7 +93,7 @@ export function deriveRunPhases(
       kind: "runnable",
       label: PHASE_LABEL.runnable,
       startMs: runnableMs,
-      endMs: startingMs ?? runningMs,
+      endMs: startingMs ?? runningMs ?? terminalMs,
     });
   }
 
@@ -96,7 +102,7 @@ export function deriveRunPhases(
       kind: "initializing",
       label: PHASE_LABEL.initializing,
       startMs: startingMs,
-      endMs: runningMs,
+      endMs: runningMs ?? terminalMs,
     });
   }