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/lib/beta-promotion.ts

@@ -0,0 +1,14 @@
+export interface BetaPromotionPreview {
+    betaId: number;
+    token: string;
+    createdAt: string;
+    files: Array<{
+        id: number; name: string; kind: string; path: string; versionId: number;
+        version: number; release_version: string | null; sha256: string;
+        scope: string; servers: string[];
+    }>;
+    servers: Array<{ name: string; tested: boolean; game: string | null; map: string | null }>;
+    configWrites: Array<{ server: string; path: string; sha256: string | null; error: string | null }>;
+    blockers: string[];
+    restartPolicy: 'additional-when-empty';
+}