The board's symbol takes a tint — a 4×2 colour row under the picker's glyphs, and the glyph itself moves into the titlebar

iconColor stops being hand-written-only (user-ruled, superseding 03's
"schema yes, control no"): it rides StyleCommand.apply → applyStyle as
the third styled dimension — per-dimension no-op skip, one bracket, one
history step, ExpectedField.iconColor for staleness. The SymbolPicker
grows an opt-in colour row (leading None plus seven Palette.foregrounds
hues, None removes the key); the board popover is its one caller. The
window-title widget now draws the board's resolved glyph in that tint
beside the name. Doc realignment filed on the Redesign board (Minor).

Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY

Kanban/History/HistoryStaleness.swift

@@ -42,6 +42,11 @@ public enum ExpectedField: Sendable, Equatable {
     /// `icon` — the styling gesture's symbol dimension.
     case icon(String?)
 
+    /// `iconColor` — the symbol's tint, the styling gesture's third dimension since the board
+    /// popover's symbol picker grew its colour row (2026-08-07; previously "schema yes, control
+    /// no"). `nil` is the removed key — the None well — exactly as everywhere else here.
+    case iconColor(String?)
+
     /// The body span, **byte for byte** — the Edit session's step, and the one inverse in the app
     /// whose fidelity is not field-level (13: "body steps compare bytes").
     case body(String)
@@ -57,6 +62,7 @@ public enum ExpectedField: Sendable, Equatable {
         case .background: .background
         case .backgroundImage: .backgroundImage
         case .icon: .icon
+        case .iconColor: .iconColor
         case .body: .body
         }
     }
@@ -70,6 +76,7 @@ public enum ExpectedField: Sendable, Equatable {
         case background
         case backgroundImage
         case icon
+        case iconColor
         case body
     }
 }
@@ -332,6 +339,7 @@ public enum HistoryStaleness {
         case let .background(expected): equal(document.background, expected)
         case let .backgroundImage(expected): equal(document.backgroundImage, expected)
         case let .icon(expected): equal(document.icon, expected)
+        case let .iconColor(expected): equal(document.iconColor, expected)
         case let .body(expected): document.body == expected
         }
     }