style: align chat thinking indicator with brand blue

Use DashboardView Theme brand blue (#2557a7) for sparkle, glow, and dots
instead of warm accent colors so the typing affordance matches Indeed.

Co-authored-by: Cursor <cursoragent@cursor.com>

App for Indeed/Views/DashboardView.swift

@@ -2857,13 +2857,18 @@ private class HoverableView: NSView {
     }
 }
 
-/// Single sparkle with a soft warm glow and three dots whose opacity animates in a staggered wave (typing-style “thinking” affordance).
+/// Single sparkle with a soft brand-blue glow and three dots whose opacity animates in a staggered wave (typing-style “thinking” affordance).
 private final class ChatThinkingIndicatorView: NSView {
     private enum AnimationKey {
         static let dotOpacity = "thinkingDotOpacity"
         static let sparklePulse = "thinkingSparklePulse"
     }
 
+    /// Matches `DashboardView.Theme.brandBlue` — Indeed-style `#2557a7`.
+    private static let accentBlue = NSColor(srgbRed: 37 / 255, green: 87 / 255, blue: 167 / 255, alpha: 1)
+    /// Slightly lighter blue for the sparkle glow (reads clearly on light banner/chat surfaces).
+    private static let accentBlueGlow = NSColor(srgbRed: 54 / 255, green: 130 / 255, blue: 220 / 255, alpha: 1)
+
     private let sparkleView = NSImageView()
     private let dotStack = NSStackView()
     private var dotViews: [NSView] = []
@@ -2880,10 +2885,10 @@ private final class ChatThinkingIndicatorView: NSView {
         sparkleView.translatesAutoresizingMaskIntoConstraints = false
         sparkleView.image = NSImage(systemSymbolName: "sparkle", accessibilityDescription: nil)
         sparkleView.symbolConfiguration = NSImage.SymbolConfiguration(pointSize: sparklePoint, weight: .medium)
-        sparkleView.contentTintColor = NSColor(srgbRed: 232 / 255, green: 104 / 255, blue: 128 / 255, alpha: 1)
+        sparkleView.contentTintColor = Self.accentBlue
         sparkleView.wantsLayer = true
         sparkleView.layer?.masksToBounds = false
-        sparkleView.layer?.shadowColor = NSColor(srgbRed: 242 / 255, green: 96 / 255, blue: 132 / 255, alpha: 1).cgColor
+        sparkleView.layer?.shadowColor = Self.accentBlueGlow.cgColor
         sparkleView.layer?.shadowRadius = compact ? 5 : 9
         sparkleView.layer?.shadowOpacity = 0.55
         sparkleView.layer?.shadowOffset = .zero
@@ -2898,7 +2903,7 @@ private final class ChatThinkingIndicatorView: NSView {
         dotStack.alignment = .centerY
         dotStack.translatesAutoresizingMaskIntoConstraints = false
 
-        let dotFill = NSColor(srgbRed: 118 / 255, green: 118 / 255, blue: 122 / 255, alpha: 1)
+        let dotFill = Self.accentBlue
         for _ in 0..<3 {
             let dot = NSView()
             dot.translatesAutoresizingMaskIntoConstraints = false