feat(stats): redesign the omp stats dashboard

Rewrite the local `omp stats` web UI on the OMP brand palette with a left nav, focused per-section views, a new Projects view, a system-aware light/dark toggle, and flicker-free navigation. Same data, endpoints, and command; the only server change is a 1h time-range bucketing fix in the aggregator.

packages/stats/test/client-view-models.test.ts

@@ -0,0 +1,34 @@
+import { describe, expect, it } from "bun:test";
+import { buildModelPerformanceLookup } from "../src/client/data/view-models";
+import type { ModelPerformancePoint } from "../src/shared-types";
+
+const DAY = 24 * 60 * 60 * 1000;
+
+describe("client view models", () => {
+	it("keeps sparse all-time model performance buckets instead of dropping old points", () => {
+		const points: ModelPerformancePoint[] = [
+			{
+				timestamp: DAY,
+				model: "gpt-5.5",
+				provider: "openai-codex",
+				requests: 1,
+				avgTtft: 250,
+				avgTokensPerSecond: 40,
+			},
+			{
+				timestamp: DAY * 10,
+				model: "gpt-5.5",
+				provider: "openai-codex",
+				requests: 2,
+				avgTtft: 500,
+				avgTokensPerSecond: 60,
+			},
+		];
+
+		const series = buildModelPerformanceLookup(points, "all").get("gpt-5.5::openai-codex");
+
+		expect(series?.data.map(point => point.timestamp)).toEqual([DAY, DAY * 10]);
+		expect(series?.data.map(point => point.requests)).toEqual([1, 2]);
+		expect(series?.data.map(point => point.avgTtftSeconds)).toEqual([0.25, 0.5]);
+	});
+});

packages/stats/test/priority-premium-requests.test.ts

@@ -77,14 +77,13 @@ function assistantEntry(opts: {
 }
 
 describe("priority service-tier premium-request backfill", () => {
-	it("derives premium_requests from service_tier_change entries for OpenAI traffic", async () => {
+	it("derives premium_requests from service_tier_change entries for providers that honor priority", async () => {
 		await writeSession("--tmp--proj", "01.jsonl", {
 			lines: [
 				{ type: "session", version: 1, id: "s1", timestamp: new Date().toISOString(), cwd: "/tmp/proj" },
 				{ type: "service_tier_change", id: "stc1", timestamp: new Date().toISOString(), serviceTier: "priority" },
 				assistantEntry({ id: "a1", provider: "openai" }),
 				assistantEntry({ id: "a2", provider: "openai-codex" }),
-				// Provider that doesn't honor service_tier — stays at zero.
 				assistantEntry({ id: "a3", provider: "anthropic" }),
 				{ type: "service_tier_change", id: "stc2", timestamp: new Date().toISOString(), serviceTier: null },
 				assistantEntry({ id: "a4", provider: "openai" }),
@@ -95,7 +94,7 @@ describe("priority service-tier premium-request backfill", () => {
 
 		const overall = await getOverallStats();
 		expect(overall.totalRequests).toBe(4);
-		expect(overall.totalPremiumRequests).toBe(2);
+		expect(overall.totalPremiumRequests).toBe(3);
 	});
 
 	it("preserves an existing non-zero premiumRequests value (Copilot multiplier) even under priority tier", async () => {