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/BoardStoreHistory.swift

@@ -367,8 +367,10 @@ extension BoardStore {
     ///
     /// `.remove` is spelled as `nil`, which is the after-value the None well leaves: the key is gone,
     /// and the item renders the level's default (03-board-ui.md § Styling ▸ Controls).
-    static func styledFields(background: StyleChange, icon: StyleChange) -> [ExpectedField] {
-        field(background, as: ExpectedField.background) + field(icon, as: ExpectedField.icon)
+    static func styledFields(background: StyleChange, icon: StyleChange, iconColor: StyleChange) -> [ExpectedField] {
+        field(background, as: ExpectedField.background)
+            + field(icon, as: ExpectedField.icon)
+            + field(iconColor, as: ExpectedField.iconColor)
     }
 
     /// The same dimensions, holding the values the *inverse* restores — what the redo half validates
@@ -381,7 +383,9 @@ extension BoardStore {
         background: StyleChange,
         priorBackground: FieldValue<String>,
         icon: StyleChange,
-        priorIcon: FieldValue<String>
+        priorIcon: FieldValue<String>,
+        iconColor: StyleChange,
+        priorIconColor: FieldValue<String>
     ) -> [ExpectedField] {
         var fields: [ExpectedField] = []
         if background != .keep {
@@ -390,6 +394,9 @@ extension BoardStore {
         if icon != .keep {
             fields.append(.icon(priorIcon.value))
         }
+        if iconColor != .keep {
+            fields.append(.iconColor(priorIconColor.value))
+        }
         return fields
     }