fix(ui): correct usage range totals and muted styles

CHANGELOG.md

@@ -17,6 +17,8 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- UI/Usage: replace lingering undefined `var(--text-muted)` usage with `var(--muted)` in usage date-range and chart styles to keep muted text visible across themes. (#17975) Thanks @jogelin.
+- UI/Usage: preserve selected-range totals when timeline data is downsampled by bucket-aggregating timeseries points (instead of dropping intermediate points), so filtered tokens/cost stay accurate. (#17959) Thanks @jogelin.
 - Mattermost: harden reaction handling by requiring an explicit boolean `remove` flag and routing reaction websocket events to the reaction handler, preventing string `"true"` values from being treated as removes and avoiding double-processing of reaction events as posts. (#18608) Thanks @echo931.
 - Scripts/UI/Windows: fix `pnpm ui:*` spawn `EINVAL` failures by restoring shell-backed launch for `.cmd`/`.bat` runners, narrowing shell usage to launcher types that require it, and rejecting unsafe forwarded shell metacharacters in UI script args. (#18594)
 - Hooks/Session-memory: recover `/new` conversation summaries when session pointers are reset-path or missing `sessionFile`, and consistently prefer the newest `.jsonl.reset.*` transcript candidate for fallback extraction. (#18088)

src/infra/session-cost-usage.test.ts

@@ -371,4 +371,57 @@ describe("session cost usage", () => {
       }
     }
   });
+
+  it("preserves totals and cumulative values when downsampling timeseries", async () => {
+    const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-timeseries-downsample-"));
+    const sessionsDir = path.join(root, "agents", "main", "sessions");
+    await fs.mkdir(sessionsDir, { recursive: true });
+    const sessionFile = path.join(sessionsDir, "sess-downsample.jsonl");
+
+    const entries = Array.from({ length: 10 }, (_, i) => {
+      const idx = i + 1;
+      return {
+        type: "message",
+        timestamp: new Date(Date.UTC(2026, 1, 12, 10, idx, 0)).toISOString(),
+        message: {
+          role: "assistant",
+          provider: "openai",
+          model: "gpt-5.2",
+          usage: {
+            input: idx,
+            output: idx * 2,
+            cacheRead: 0,
+            cacheWrite: 0,
+            totalTokens: idx * 3,
+            cost: { total: idx * 0.001 },
+          },
+        },
+      };
+    });
+
+    await fs.writeFile(
+      sessionFile,
+      entries.map((entry) => JSON.stringify(entry)).join("\n"),
+      "utf-8",
+    );
+
+    const timeseries = await loadSessionUsageTimeSeries({
+      sessionFile,
+      maxPoints: 3,
+    });
+
+    expect(timeseries).toBeTruthy();
+    expect(timeseries?.points.length).toBe(3);
+
+    const points = timeseries?.points ?? [];
+    const totalTokens = points.reduce((sum, point) => sum + point.totalTokens, 0);
+    const totalCost = points.reduce((sum, point) => sum + point.cost, 0);
+    const lastPoint = points[points.length - 1];
+
+    // Full-series totals: sum(1..10)*3 = 165 tokens, sum(1..10)*0.001 = 0.055 cost.
+    expect(totalTokens).toBe(165);
+    expect(totalCost).toBeCloseTo(0.055, 8);
+    expect(lastPoint?.cumulativeTokens).toBe(165);
+    expect(lastPoint?.cumulativeCost).toBeCloseTo(0.055, 8);
+  });
 });

src/infra/session-cost-usage.ts

@@ -2,15 +2,8 @@ import fs from "node:fs";
 import path from "node:path";
 import readline from "node:readline";
 import type { NormalizedUsage, UsageLike } from "../agents/usage.js";
-import { normalizeUsage } from "../agents/usage.js";
 import type { OpenClawConfig } from "../config/config.js";
-import {
-  resolveSessionFilePath,
-  resolveSessionTranscriptsDirForAgent,
-} from "../config/sessions/paths.js";
 import type { SessionEntry } from "../config/sessions/types.js";
-import { countToolResults, extractToolCallNames } from "../utils/transcript-tools.js";
-import { estimateUsageCost, resolveModelCostConfig } from "../utils/usage-format.js";
 import type {
   CostBreakdown,
   CostUsageTotals,
@@ -31,6 +24,13 @@ import type {
   SessionUsageTimePoint,
   SessionUsageTimeSeries,
 } from "./session-cost-usage.types.js";
+import { normalizeUsage } from "../agents/usage.js";
+import {
+  resolveSessionFilePath,
+  resolveSessionTranscriptsDirForAgent,
+} from "../config/sessions/paths.js";
+import { countToolResults, extractToolCallNames } from "../utils/transcript-tools.js";
+import { estimateUsageCost, resolveModelCostConfig } from "../utils/usage-format.js";
 
 export type {
   CostUsageDailyEntry,
@@ -799,12 +799,44 @@ export async function loadSessionUsageTimeSeries(params: {
   if (sortedPoints.length > maxPoints) {
     const step = Math.ceil(sortedPoints.length / maxPoints);
     const downsampled: SessionUsageTimePoint[] = [];
+    let downsampledCumulativeTokens = 0;
+    let downsampledCumulativeCost = 0;
     for (let i = 0; i < sortedPoints.length; i += step) {
-      downsampled.push(sortedPoints[i]);
+      const bucket = sortedPoints.slice(i, i + step);
-    }
+      const bucketLast = bucket[bucket.length - 1];
-    // Always include the last point
+      if (!bucketLast) {
-    if (downsampled[downsampled.length - 1] !== sortedPoints[sortedPoints.length - 1]) {
+        continue;
-      downsampled.push(sortedPoints[sortedPoints.length - 1]);
+      }
+
+      let bucketInput = 0;
+      let bucketOutput = 0;
+      let bucketCacheRead = 0;
+      let bucketCacheWrite = 0;
+      let bucketTotalTokens = 0;
+      let bucketCost = 0;
+      for (const point of bucket) {
+        bucketInput += point.input;
+        bucketOutput += point.output;
+        bucketCacheRead += point.cacheRead;
+        bucketCacheWrite += point.cacheWrite;
+        bucketTotalTokens += point.totalTokens;
+        bucketCost += point.cost;
+      }
+
+      downsampledCumulativeTokens += bucketTotalTokens;
+      downsampledCumulativeCost += bucketCost;
+
+      downsampled.push({
+        timestamp: bucketLast.timestamp,
+        input: bucketInput,
+        output: bucketOutput,
+        cacheRead: bucketCacheRead,
+        cacheWrite: bucketCacheWrite,
+        totalTokens: bucketTotalTokens,
+        cost: bucketCost,
+        cumulativeTokens: downsampledCumulativeTokens,
+        cumulativeCost: downsampledCumulativeCost,
+      });
     }
     return { sessionId: params.sessionId, points: downsampled };
   }

ui/src/ui/views/usage-styles/usageStyles-part3.ts

@@ -513,7 +513,7 @@ export const usageStylesPart3 = `
   /* ===== CHART AXIS ===== */
   .ts-axis-label {
     font-size: 5px;
-    fill: var(--text-muted);
+    fill: var(--muted);
   }
 
   /* ===== RANGE SELECTION HANDLES ===== */
@@ -537,7 +537,7 @@ export const usageStylesPart3 = `
     border-radius: 999px;
     padding: 2px 10px;
     font-size: 11px;
-    color: var(--text-muted);
+    color: var(--muted);
     cursor: pointer;
     transition: all 0.15s ease;
     margin-left: 8px;

ui/src/ui/views/usage.ts

@@ -86,7 +86,7 @@ export function renderUsage(props: UsageProps) {
           <div style="display: flex; flex-direction: column; align-items: flex-end; gap: 8px;">
             <div style="display: flex; gap: 8px; align-items: center;">
               <input type="date" .value=${props.startDate} disabled style="padding: 6px 10px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg); color: var(--text); font-size: 13px; opacity: 0.6;" />
-              <span style="color: var(--text-muted);">to</span>
+              <span style="color: var(--muted);">to</span>
               <input type="date" .value=${props.endDate} disabled style="padding: 6px 10px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg); color: var(--text); font-size: 13px; opacity: 0.6;" />
             </div>
           </div>
@@ -592,7 +592,7 @@ export function renderUsage(props: UsageProps) {
             title="Start Date"
             @change=${(e: Event) => props.onStartDateChange((e.target as HTMLInputElement).value)}
           />
-          <span style="color: var(--text-muted);">to</span>
+          <span style="color: var(--muted);">to</span>
           <input
             type="date"
             .value=${props.endDate}

vitest.config.ts

@@ -33,7 +33,12 @@ export default defineConfig({
     unstubGlobals: true,
     pool: "forks",
     maxWorkers: isCI ? ciWorkers : localWorkers,
-    include: ["src/**/*.test.ts", "extensions/**/*.test.ts", "test/**/*.test.ts"],
+    include: [
+      "src/**/*.test.ts",
+      "extensions/**/*.test.ts",
+      "test/**/*.test.ts",
+      "ui/src/ui/views/usage-render-details.test.ts",
+    ],
     setupFiles: ["test/setup.ts"],
     exclude: [
       "dist/**",