Improve operational UX, recovery flows, and action safety

Implement the approved UX review across Fleet, Betas, Library, deployments, and Settings. Add reviewed promotion and reconciliation plans, atomic queued-removal cancellation, recoverable beta drafts and launch inputs, accessible controls, and mobile improvements.

Validated with 473 tests, a clean typecheck, production build, and isolated desktop/mobile browser walkthroughs. Include the review and implementation coverage notes.

src/routes/api/betas/+server.ts

@@ -32,9 +32,13 @@ export async function GET({ url }: { url: URL }) {
                     : null
             };
         });
+        const test = storedPlan(b.id);
+        const plan = test ? parseBetaPlan(JSON.parse(test.plan)) : null;
         return {
             ...b,
-            testOutcome: storedPlan(b.id)?.outcome ?? null,
+            testOutcome: test?.outcome ?? null,
+            testReason: test?.reason ?? null,
+            deadlineAt: plan ? new Date(Date.parse(b.opened_at) + plan.timeoutHours * 3600000).toISOString() : null,
             scripts,
             servers: listBetaServers(b.id)
         };