diff --git a/Sources/CodingBar/SelfTest.swift b/Sources/CodingBar/SelfTest.swift
index 9129fbd..55b4dfc 100644
--- a/Sources/CodingBar/SelfTest.swift
+++ b/Sources/CodingBar/SelfTest.swift
@@ -66,6 +66,31 @@ enum SelfTest {
         let mixed = claudeWindows + codexWindows
         check("tightestRemaining picks most-depleted", abs((mixed.tightestRemaining ?? 1) - 0.26) < 0.0001)
 
+        // ── Forecast (provider-agnostic: same path for Claude and Codex) ─────────
+        let fcCal = Calendar.current
+        let fcNow = fcCal.date(from: DateComponents(year: 2026, month: 6, day: 24, hour: 12))!  // Wednesday
+        let fcDay = 86_400.0, fcT0 = fcNow.timeIntervalSince1970
+        func fcPt(_ d: Double, _ r: Double) -> Forecaster.Point { (t: fcT0 + d * fcDay, r: r) }
+        // Live window 1.0 → 0.10 over 6 days ⇒ zero ≈ now + 0.667 day (16h).
+        let fcLive = (0...6).map { fcPt(-6 + Double($0), 1.0 - 0.9 * (Double($0) / 6.0)) }
+        let fcResetFar = fcNow.addingTimeInterval(3 * fcDay)
+        let fcLiveZero = Forecaster.predictDepletion(samples: fcLive, resetAt: fcResetFar, now: fcNow)
+        check("forecast projects clean decline ~16h out",
+              abs((fcLiveZero?.timeIntervalSince1970 ?? 0) - (fcT0 + (2.0 / 3.0) * fcDay)) < 3600)
+        // Samples before a reset (the old cross-reset bug) must not shift the projection.
+        let fcWithReset = [fcPt(-13, 0.30), fcPt(-12, 0.20), fcPt(-11, 0.12), fcPt(-10, 0.05)] + fcLive
+        check("forecast ignores pre-reset samples",
+              Forecaster.predictDepletion(samples: fcWithReset, resetAt: fcResetFar, now: fcNow)?.timeIntervalSince1970
+                == fcLiveZero?.timeIntervalSince1970)
+        // Window resets before the projected zero ⇒ never runs out ⇒ no forecast.
+        check("forecast suppressed when reset precedes depletion",
+              Forecaster.predictDepletion(samples: fcLive, resetAt: fcNow.addingTimeInterval(0.25 * fcDay), now: fcNow) == nil)
+        // Day always spelled out so a multi-day-out "Mon" can't read as a past weekday.
+        let fcToday = fcCal.date(bySettingHour: 15, minute: 0, second: 0, of: fcNow)!
+        let fc3d = fcCal.date(byAdding: .day, value: 3, to: fcNow)!  // Wed + 3 = Saturday
+        check("forecast formats same-day as today", Forecaster.formatDepletion(fcToday, now: fcNow, language: .en) == "today 15:00")
+        check("forecast formats multi-day as weekday", Forecaster.formatDepletion(fc3d, now: fcNow, language: .en).hasPrefix("Sat "))
+
         print(failures == 0 ? "ALL PASS" : "\(failures) FAILED")
         return failures == 0 ? 0 : 1
     }
diff --git a/Sources/CodingBar/Views/Panel/PanelCharts.swift b/Sources/CodingBar/Views/Panel/PanelCharts.swift
index 155bfe7..97db8c0 100644
--- a/Sources/CodingBar/Views/Panel/PanelCharts.swift
+++ b/Sources/CodingBar/Views/Panel/PanelCharts.swift
@@ -1,7 +1,7 @@
 import SwiftUI
 import CodingBarCore
 
-// MARK: - Spend sparkline (prototype: polyline + 10% area fill + last dot)
+// MARK: - Spend sparkline (smooth spline + 10% area fill + last dot)
 
 struct DCSparkline: View {
     @Environment(\.dc) private var dc
@@ -19,7 +19,8 @@ struct DCSparkline: View {
             ZStack {
                 Path { p in
                     p.move(to: CGPoint(x: pad, y: h))
-                    pts.forEach { p.addLine(to: $0) }
+                    if let first = pts.first { p.addLine(to: first) }
+                    Self.addSmoothCurve(&p, through: pts)
                     p.addLine(to: CGPoint(x: w - pad, y: h))
                     p.closeSubpath()
                 }
@@ -27,7 +28,7 @@ struct DCSparkline: View {
                 Path { p in
                     guard let first = pts.first else { return }
                     p.move(to: first)
-                    pts.dropFirst().forEach { p.addLine(to: $0) }
+                    Self.addSmoothCurve(&p, through: pts)
                 }
                 .stroke(dc.accent, style: StrokeStyle(lineWidth: 1.6, lineCap: .round, lineJoin: .round))
                 if let last = pts.last {
@@ -37,6 +38,19 @@ struct DCSparkline: View {
         }
         .frame(height: 36)
     }
+
+    // Catmull-Rom → cubic Bézier: smooths the polyline without overshooting the
+    // data points (tension 1/6). Assumes `p` is already positioned at pts[0];
+    // shared by the stroke and the area fill so their outlines match exactly.
+    private static func addSmoothCurve(_ p: inout Path, through pts: [CGPoint]) {
+        guard pts.count > 1 else { return }
+        for i in 0..<(pts.count - 1) {
+            let p0 = pts[max(i - 1, 0)], p1 = pts[i], p2 = pts[i + 1], p3 = pts[min(i + 2, pts.count - 1)]
+            let c1 = CGPoint(x: p1.x + (p2.x - p0.x) / 6, y: p1.y + (p2.y - p0.y) / 6)
+            let c2 = CGPoint(x: p2.x - (p3.x - p1.x) / 6, y: p2.y - (p3.y - p1.y) / 6)
+            p.addCurve(to: p2, control1: c1, control2: c2)
+        }
+    }
 }
 
 // MARK: - Code-output add/remove ratio bar (height 5)
diff --git a/Sources/CodingBar/Views/Panel/PanelView.swift b/Sources/CodingBar/Views/Panel/PanelView.swift
index 3576673..3fe9ab7 100644
--- a/Sources/CodingBar/Views/Panel/PanelView.swift
+++ b/Sources/CodingBar/Views/Panel/PanelView.swift
@@ -6,6 +6,9 @@ import CodingBarCore
 // Header · active tab (总览 / 构成 / 洞察) · provenance · bottom nav.
 struct PanelView: View {
     @ObservedObject var store: UsageStore
+    // Drives the header's "立即更新" pill: Sparkle flips hasAvailableUpdate when a
+    // background/manual check finds a release, and this re-renders the header.
+    @ObservedObject private var updater = UpdateManager.shared
     @Environment(\.colorScheme) private var systemScheme
     @State private var tab: Int
     @State private var refreshSpin: Double = 0
@@ -87,13 +90,15 @@ struct PanelView: View {
         HStack(spacing: 8) {
             brandMark
             Text("CodingBar").font(.system(size: 13, weight: .semibold)).tracking(-0.13).foregroundStyle(dc.fg)
+                .fixedSize()
             HStack(spacing: 5) {
                 BreathingDot(size: 6, color: burning ? dc.good : dc.fg3, animate: burning)
-                Text(statusText).font(.system(size: 10.5)).foregroundStyle(dc.fg2)
+                Text(statusText).font(.system(size: 10.5)).foregroundStyle(dc.fg2).lineLimit(1).fixedSize()
             }
             .padding(.leading, 6).padding(.trailing, 7).padding(.vertical, 2)
             .background(Capsule().fill(dc.hover))
             Spacer()
+            updatePill
             metricToggle
             Button { doRefresh() } label: {
                 Image(systemName: "arrow.clockwise").font(.system(size: 9, weight: .regular)).foregroundStyle(dc.fg3)
@@ -112,6 +117,28 @@ struct PanelView: View {
         .padding(.horizontal, 13).padding(.top, 11).padding(.bottom, 10)
     }
 
+    /// "立即更新" pill — appears in the header only once Sparkle has a verified
+    /// update in hand (so it never shows in dev builds, where canUpdate is false).
+    /// Accent-filled so it reads as the one actionable item in the corner cluster;
+    /// tapping hands off to Sparkle's standard update prompt.
+    @ViewBuilder private var updatePill: some View {
+        if updater.canUpdate && updater.hasAvailableUpdate {
+            Button { updater.checkForUpdates() } label: {
+                HStack(spacing: 3) {
+                    Image(systemName: "arrow.down.circle.fill").font(.system(size: 9, weight: .semibold))
+                    Text(lang.t("Update", "立即更新")).font(.system(size: 10, weight: .semibold))
+                }
+                .fixedSize()
+                .foregroundStyle(.white)
+                .padding(.leading, 5).padding(.trailing, 7).padding(.vertical, 2)
+                .background(Capsule().fill(dc.accent))
+                .contentShape(Capsule())
+            }
+            .buttonStyle(.plain).focusEffectDisabled()
+            .help(lang.t("A new version is available — update now", "有新版本可用 — 立即更新"))
+        }
+    }
+
     /// Metric toggle (花费 ⇄ Token) — same size / weight / color / padding as the
     /// refresh button so the two read as a matched pair. The icon shows the
     /// *current* metric; tapping flips both the panel and the menu bar.
diff --git a/Sources/CodingBarCore/Forecast.swift b/Sources/CodingBarCore/Forecast.swift
index 34b4fe0..2f13d4a 100644
--- a/Sources/CodingBarCore/Forecast.swift
+++ b/Sources/CodingBarCore/Forecast.swift
@@ -86,47 +86,79 @@ public enum Forecaster {
     public static func recordAndForecast(quota: [QuotaWindow], now: Date, language: AppLanguage = .en) -> Insight? {
         let history = appendAndPrune(quota: quota, now: now)
 
-        // Forecast for Codex weekly window ("7d")
-        let weekSamples = history
+        // Forecast for the Codex weekly window ("7d")
+        let points = history
             .filter { $0.provider == Provider.codex.rawValue && $0.label == "7d" }
             .sorted { $0.date < $1.date }
+            .map { Point(t: $0.date, r: $0.remaining) }
+        let resetAt = quota.first { $0.provider == .codex && $0.label == "7d" }?.resetAt
 
-        guard let tZero = regressZero(weekSamples),
-              tZero > now.timeIntervalSince1970 else { return nil }
-        let when = formatDepletion(Date(timeIntervalSince1970: tZero), language: language)
-        let text = language.t("Weekly quota runs out \(when)", "周额度预计 \(when) 见底")
+        guard let when = predictDepletion(samples: points, resetAt: resetAt, now: now) else { return nil }
+        let whenStr = formatDepletion(when, now: now, language: language)
+        let text = language.t("Weekly quota runs out \(whenStr)", "周额度预计 \(whenStr) 见底")
         return Insight(kind: .forecast, text: text)
     }
 
     /// For each provider that has a weekly window, forecast when it depletes.
-    /// Returns `[Provider.rawValue: "<Name> 周额度预计 <weekday> <time> 见底"]`.
+    /// Returns `[Provider.rawValue: "<Name> 周额度预计 <when> 见底"]`.
     /// Reads the history persisted by `recordAndForecast`, so call that first.
     public static func forecastByProvider(quota: [QuotaWindow], now: Date, language: AppLanguage = .en) -> [String: String] {
         let history = loadHistoryLocked()
         var out: [String: String] = [:]
         for provider in [Provider.claude, Provider.codex] {
-            guard quota.contains(where: { $0.provider == provider && $0.label == "7d" }) else { continue }
-            let samples = history
+            guard let window = quota.first(where: { $0.provider == provider && $0.label == "7d" }) else { continue }
+            let points = history
                 .filter { $0.provider == provider.rawValue && $0.label == "7d" }
                 .sorted { $0.date < $1.date }
-            guard let tZero = regressZero(samples), tZero > now.timeIntervalSince1970 else { continue }
+                .map { Point(t: $0.date, r: $0.remaining) }
+            guard let when = predictDepletion(samples: points, resetAt: window.resetAt, now: now) else { continue }
             let name = provider == .claude ? "Claude" : "Codex"
-            let when = formatDepletion(Date(timeIntervalSince1970: tZero), language: language)
-            out[provider.rawValue] = language.t("\(name) weekly quota runs out \(when)", "\(name) 周额度预计 \(when) 见底")
+            let whenStr = formatDepletion(when, now: now, language: language)
+            out[provider.rawValue] = language.t("\(name) weekly quota runs out \(whenStr)", "\(name) 周额度预计 \(whenStr) 见底")
         }
         return out
     }
 
+    public typealias Point = (t: Double, r: Double)   // (epoch seconds, remaining 0...1)
+
+    /// Predict when the *current* window hits zero, or nil if it won't run out before it
+    /// resets. Public so the self-test / XCTest can exercise the pure math without touching
+    /// the disk-backed history.
+    public static func predictDepletion(samples: [Point], resetAt: Date?, now: Date) -> Date? {
+        guard let tZero = regressZero(currentWindow(samples)),
+              tZero > now.timeIntervalSince1970 else { return nil }
+        let when = Date(timeIntervalSince1970: tZero)
+        // A window that resets before the projected zero never actually "runs out" — its
+        // remaining fraction snaps back to 1 at the reset. Emitting a post-reset date is
+        // exactly what made the forecast read as nonsense ("runs out next Mon" while the
+        // window resets tomorrow), so suppress it.
+        if let resetAt, when >= resetAt { return nil }
+        return when
+    }
+
+    /// Keep only the samples since the most recent reset. A reset shows up as `remaining`
+    /// jumping back up versus the prior sample; regressing across that sawtooth blends the
+    /// spike with the genuine decline, flattening the slope and pushing the zero-crossing
+    /// days past the truth. The live window is the only one whose depletion we can predict.
+    private static func currentWindow(_ samples: [Point]) -> [Point] {
+        guard !samples.isEmpty else { return samples }
+        var start = 0
+        // 0.05 is well above the 0.01 quota rounding / sampling noise, so only a real
+        // reset (≈0 → ≈1) trips it, not a flat or slightly-jittery decline.
+        for i in 1..<samples.count where samples[i].r > samples[i - 1].r + 0.05 { start = i }
+        return Array(samples[start...])
+    }
+
     /// Linear-regress `remaining ~ a + b·t` over the samples and return the time
     /// (epoch seconds) at which remaining hits 0, or nil if the trend isn't a
     /// clear decline.
-    private static func regressZero(_ samples: [QuotaSample]) -> Double? {
+    private static func regressZero(_ samples: [Point]) -> Double? {
         guard samples.count >= 2 else { return nil }
         let n = Double(samples.count)
-        let sumT = samples.reduce(0.0) { $0 + $1.date }
-        let sumR = samples.reduce(0.0) { $0 + $1.remaining }
-        let sumT2 = samples.reduce(0.0) { $0 + $1.date * $1.date }
-        let sumTR = samples.reduce(0.0) { $0 + $1.date * $1.remaining }
+        let sumT = samples.reduce(0.0) { $0 + $1.t }
+        let sumR = samples.reduce(0.0) { $0 + $1.r }
+        let sumT2 = samples.reduce(0.0) { $0 + $1.t * $1.t }
+        let sumTR = samples.reduce(0.0) { $0 + $1.t * $1.r }
         let denom = n * sumT2 - sumT * sumT
         guard abs(denom) > 1e-9 else { return nil }
         let b = (n * sumTR - sumT * sumR) / denom   // slope (should be negative)
@@ -135,13 +167,18 @@ public enum Forecaster {
         return -a / b
     }
 
-    /// "Thu 15:00" / "周四 15:00" — weekday + HH:mm of a predicted depletion date.
-    private static func formatDepletion(_ date: Date, language: AppLanguage) -> String {
+    /// "today 09:08" / "tomorrow 08:30" / "Thu 15:00" — the day is always spelled out so a
+    /// multi-day-out forecast can't be misread as a weekday that just passed (a bare "Mon"
+    /// five days out reads as the Monday that already went by). Public for tests.
+    public static func formatDepletion(_ date: Date, now: Date, language: AppLanguage) -> String {
         let cal = Calendar.current
+        let time = String(format: "%02d:%02d", cal.component(.hour, from: date), cal.component(.minute, from: date))
+        let dayDiff = cal.dateComponents([.day], from: cal.startOfDay(for: now), to: cal.startOfDay(for: date)).day ?? 0
+        if dayDiff == 0 { return language.t("today \(time)", "今天 \(time)") }
+        if dayDiff == 1 { return language.t("tomorrow \(time)", "明天 \(time)") }
         let names = language.t("Sun Mon Tue Wed Thu Fri Sat", "周日 周一 周二 周三 周四 周五 周六")
             .split(separator: " ").map(String.init)
         let wd = names[cal.component(.weekday, from: date) - 1]
-        let h = cal.component(.hour, from: date), m = cal.component(.minute, from: date)
-        return wd + " " + String(format: "%02d:%02d", h, m)
+        return wd + " " + time
     }
 }
diff --git a/Tests/CodingBarCoreTests/SmokeTests.swift b/Tests/CodingBarCoreTests/SmokeTests.swift
index bdd2ddb..49deb3d 100644
--- a/Tests/CodingBarCoreTests/SmokeTests.swift
+++ b/Tests/CodingBarCoreTests/SmokeTests.swift
@@ -290,6 +290,55 @@ final class SmokeTests: XCTestCase {
         XCTAssertFalse(Pricing.priceIsExact(model: "totally-unknown-model"))  // generic fallback rate
     }
 
+    /// The Codex weekly forecast used to linear-regress across quota *resets*: a 14-day
+    /// history is a sawtooth (remaining snaps back to ~1 each week), so the blended slope
+    /// flattened and the projected zero landed ~5 days out — then it rendered as a bare
+    /// weekday ("Mon"), which read as the Monday that had already passed. The fix regresses
+    /// only the live window, suppresses zeros falling after the window resets, and always
+    /// spells out the day. Guards all three so the regression can't silently return.
+    func testWeeklyForecastIgnoresResetsAndDisambiguatesDay() {
+        let cal = Calendar.current
+        let now = cal.date(from: DateComponents(year: 2026, month: 6, day: 24, hour: 12))!  // a Wednesday
+        let day = 86_400.0
+        let t0 = now.timeIntervalSince1970
+        func pt(_ daysFromNow: Double, _ r: Double) -> (t: Double, r: Double) { (t: t0 + daysFromNow * day, r: r) }
+
+        // Live window: declines 1.0 → 0.10 over the last 6 days. Analytic zero: the slope is
+        // 0.90 over 6 days = 0.15/day, so r hits 0 at 0.10/0.15 = 0.667 day after now.
+        let live = (0...6).map { pt(-6 + Double($0), 1.0 - 0.9 * (Double($0) / 6.0)) }
+        let expectedZero = t0 + (2.0 / 3.0) * day
+
+        let resetFar = now.addingTimeInterval(3 * day)   // resets well after the projected zero
+        guard let liveZero = Forecaster.predictDepletion(samples: live, resetAt: resetFar, now: now) else {
+            return XCTFail("a clean declining window must project a depletion")
+        }
+        XCTAssertEqual(liveZero.timeIntervalSince1970, expectedZero, accuracy: 3600,
+                       "clean declining window should project ~16h out")
+
+        // Prepend a *previous* window (0.30 → 0.05) before the reset jump to 1.0. Regressing
+        // the whole sawtooth (the old bug) flattens the slope; the fix trims to the live
+        // window, so the answer must be byte-identical to the live-only projection.
+        let withReset = [pt(-13, 0.30), pt(-12, 0.20), pt(-11, 0.12), pt(-10, 0.05)] + live
+        let trimmedZero = Forecaster.predictDepletion(samples: withReset, resetAt: resetFar, now: now)
+        XCTAssertEqual(trimmedZero?.timeIntervalSince1970, liveZero.timeIntervalSince1970,
+                       "samples before the reset must not shift the projection")
+
+        // A window that resets before the projected zero never runs out → no forecast.
+        let resetSoon = now.addingTimeInterval(0.25 * day)   // before the 0.667-day zero
+        XCTAssertNil(Forecaster.predictDepletion(samples: live, resetAt: resetSoon, now: now),
+                     "depletion after the reset must be suppressed")
+
+        // Day is always spelled out: today / tomorrow / weekday — never a bare ambiguous one.
+        let today15 = cal.date(bySettingHour: 15, minute: 0, second: 0, of: now)!
+        let tomorrow0830 = cal.date(byAdding: .day, value: 1, to: cal.date(bySettingHour: 8, minute: 30, second: 0, of: now)!)!
+        let inThreeDays = cal.date(byAdding: .day, value: 3, to: now)!   // Wed + 3 = Saturday
+        XCTAssertEqual(Forecaster.formatDepletion(today15, now: now, language: .en), "today 15:00")
+        XCTAssertEqual(Forecaster.formatDepletion(today15, now: now, language: .zh), "今天 15:00")
+        XCTAssertEqual(Forecaster.formatDepletion(tomorrow0830, now: now, language: .en), "tomorrow 08:30")
+        XCTAssertTrue(Forecaster.formatDepletion(inThreeDays, now: now, language: .en).hasPrefix("Sat "),
+                      "3 days out should fall back to the weekday, not today/tomorrow")
+    }
+
     func testTokenBreakdownMath() {
         var a = TokenBreakdown(input: 10, output: 5, cacheRead: 100)
         a += TokenBreakdown(input: 5, cacheWrite: 20)
diff --git a/docs/assets/menubar-2x2.png b/docs/assets/menubar-2x2.png
new file mode 100644
index 0000000..5f415e1
Binary files /dev/null and b/docs/assets/menubar-2x2.png differ
diff --git a/docs/assets/panel-composition.png b/docs/assets/panel-composition.png
index e8da04e..5865666 100644
Binary files a/docs/assets/panel-composition.png and b/docs/assets/panel-composition.png differ
diff --git a/docs/assets/panel-insights.png b/docs/assets/panel-insights.png
index 4af737c..c9219bf 100644
Binary files a/docs/assets/panel-insights.png and b/docs/assets/panel-insights.png differ
diff --git a/docs/assets/panel-light.png b/docs/assets/panel-light.png
index 3a6079b..380b2c8 100644
Binary files a/docs/assets/panel-light.png and b/docs/assets/panel-light.png differ
diff --git a/docs/assets/panel-overview.png b/docs/assets/panel-overview.png
index f0c633c..cd5ca97 100644
Binary files a/docs/assets/panel-overview.png and b/docs/assets/panel-overview.png differ
diff --git a/release-notes/v1.1.2.md b/release-notes/v1.1.2.md
new file mode 100644
index 0000000..4871ebf
--- /dev/null
+++ b/release-notes/v1.1.2.md
@@ -0,0 +1,11 @@
+- The spend sparkline now draws as a smooth curve instead of a jagged polyline.
+- When auto-check is on and a new version is available, an "Update" button now
+  appears directly in the panel header — one click to install, no need to open
+  Settings first.
+- Fixed the weekly quota forecast. It used to regress across quota resets, which
+  flattened the trend, projected depletion days out, and rendered it as a bare
+  weekday that read as a day already past. It now fits only the live window,
+  suppresses any projection that lands after the window resets, and always
+  spells the day out (today / tomorrow / weekday).
+
+**Full Changelog**: https://github.com/Gnonymous/CodingBar/compare/v1.1.1...v1.1.2