fix(a11y): rebalance the light palette so hues survive

Reported as "colors seem muted and hard to see on light mode", and
correct. The light palette optimised contrast and produced mud: #7A5600
reads olive rather than amber, #146C2E bottle-dark rather than green.
Contrast passed while the UI got harder to read, because hue identity is
what distinguishes warning from critical at a glance.

Two causes, both fixed.

Every foreground was required to clear 4.5:1 against its own 16% badge
tint — the harshest surface it ever sits on — which pushed each colour
about 20% darker than the common case needed. Most of what is actually on
screen is plain text on a card, with far more headroom. The fill is now
decoupled from the foreground: AppStatusTone carries a foreground and a
surface authored independently, with matching …Surface colorsets, so a
foreground no longer has to survive a wash of itself. Every status
foreground is now fully saturated.

And warning was yellow. Yellow cannot stay yellow at a lightness low
enough to pass 4.5:1 on white — it becomes olive. That is colorimetric,
not a tuning problem. Warning is now orange: #AD5100 light, #FF9F0A dark.

New light values: positive #008035, warning #AD5100, critical #CC0700.
Worst-case ratios 4.54–6.76 across page, card, and surface in both
schemes. Audit findings are unchanged — light 21, dark 18 — so the
vividness costs nothing.

Also picks up a literal .blue missed in phase 1: DomainDiffItem's
low-severity change colour, which the phase 1 sweep did not cover because
its pattern listed only cyan/yellow/green/red/orange/pink.

8 files changed, 409 insertions, 19 deletions

diff --git a/Shared/Colors.xcassets/StatusCritical.colorset/Contents.json b/Shared/Colors.xcassets/StatusCritical.colorset/Contents.json
index 8f97cd9..2963513 100644
--- a/Shared/Colors.xcassets/StatusCritical.colorset/Contents.json
+++ b/Shared/Colors.xcassets/StatusCritical.colorset/Contents.json
@@ -5,9 +5,9 @@
       "color": {
         "color-space": "srgb",
         "components": {
-          "red": "0xB3",
-          "green": "0x26",
-          "blue": "0x1E",
+          "red": "0xCC",
+          "green": "0x07",
+          "blue": "0x00",
           "alpha": "1.000"
         }
       }
@@ -41,9 +41,9 @@
       "color": {
         "color-space": "srgb",
         "components": {
-          "red": "0x8C",
-          "green": "0x1D",
-          "blue": "0x16",
+          "red": "0xA3",
+          "green": "0x05",
+          "blue": "0x00",
           "alpha": "1.000"
         }
       }
diff --git a/Shared/Colors.xcassets/StatusCriticalSurface.colorset/Contents.json b/Shared/Colors.xcassets/StatusCriticalSurface.colorset/Contents.json
new file mode 100644
index 0000000..31b3941
--- /dev/null
+++ b/Shared/Colors.xcassets/StatusCriticalSurface.colorset/Contents.json
@@ -0,0 +1,78 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xFB",
+          "green": "0xE0",
+          "blue": "0xDF",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x2E",
+          "green": "0x13",
+          "blue": "0x10",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xF7",
+          "green": "0xCF",
+          "blue": "0xCD",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        },
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x3D",
+          "green": "0x19",
+          "blue": "0x15",
+          "alpha": "1.000"
+        }
+      }
+    }
+  ],
+  "info": {
+    "author": "xcode",
+    "version": 1
+  }
+}
diff --git a/Shared/Colors.xcassets/StatusInfoSurface.colorset/Contents.json b/Shared/Colors.xcassets/StatusInfoSurface.colorset/Contents.json
new file mode 100644
index 0000000..e0a2c53
--- /dev/null
+++ b/Shared/Colors.xcassets/StatusInfoSurface.colorset/Contents.json
@@ -0,0 +1,78 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xDF",
+          "green": "0xE3",
+          "blue": "0xFB",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x10",
+          "green": "0x1C",
+          "blue": "0x33",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xCB",
+          "green": "0xD2",
+          "blue": "0xF7",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        },
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x15",
+          "green": "0x27",
+          "blue": "0x44",
+          "alpha": "1.000"
+        }
+      }
+    }
+  ],
+  "info": {
+    "author": "xcode",
+    "version": 1
+  }
+}
diff --git a/Shared/Colors.xcassets/StatusNeutralSurface.colorset/Contents.json b/Shared/Colors.xcassets/StatusNeutralSurface.colorset/Contents.json
new file mode 100644
index 0000000..8b8c6bd
--- /dev/null
+++ b/Shared/Colors.xcassets/StatusNeutralSurface.colorset/Contents.json
@@ -0,0 +1,78 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xEB",
+          "green": "0xED",
+          "blue": "0xEF",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x1A",
+          "green": "0x1A",
+          "blue": "0x1C",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xDF",
+          "green": "0xE1",
+          "blue": "0xE4",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        },
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x23",
+          "green": "0x23",
+          "blue": "0x26",
+          "alpha": "1.000"
+        }
+      }
+    }
+  ],
+  "info": {
+    "author": "xcode",
+    "version": 1
+  }
+}
diff --git a/Shared/Colors.xcassets/StatusPositive.colorset/Contents.json b/Shared/Colors.xcassets/StatusPositive.colorset/Contents.json
index 22ce5e5..30280d9 100644
--- a/Shared/Colors.xcassets/StatusPositive.colorset/Contents.json
+++ b/Shared/Colors.xcassets/StatusPositive.colorset/Contents.json
@@ -5,9 +5,9 @@
       "color": {
         "color-space": "srgb",
         "components": {
-          "red": "0x14",
-          "green": "0x6C",
-          "blue": "0x2E",
+          "red": "0x00",
+          "green": "0x80",
+          "blue": "0x35",
           "alpha": "1.000"
         }
       }
@@ -41,9 +41,9 @@
       "color": {
         "color-space": "srgb",
         "components": {
-          "red": "0x0B",
-          "green": "0x50",
-          "blue": "0x23",
+          "red": "0x00",
+          "green": "0x66",
+          "blue": "0x1F",
           "alpha": "1.000"
         }
       }
diff --git a/Shared/Colors.xcassets/StatusPositiveSurface.colorset/Contents.json b/Shared/Colors.xcassets/StatusPositiveSurface.colorset/Contents.json
new file mode 100644
index 0000000..dc80f8f
--- /dev/null
+++ b/Shared/Colors.xcassets/StatusPositiveSurface.colorset/Contents.json
@@ -0,0 +1,78 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xE3",
+          "green": "0xF7",
+          "blue": "0xEC",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x0E",
+          "green": "0x2A",
+          "blue": "0x18",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xD3",
+          "green": "0xF0",
+          "blue": "0xE0",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        },
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x12",
+          "green": "0x3A",
+          "blue": "0x20",
+          "alpha": "1.000"
+        }
+      }
+    }
+  ],
+  "info": {
+    "author": "xcode",
+    "version": 1
+  }
+}
diff --git a/Shared/Colors.xcassets/StatusWarning.colorset/Contents.json b/Shared/Colors.xcassets/StatusWarning.colorset/Contents.json
index cc79e86..003f80c 100644
--- a/Shared/Colors.xcassets/StatusWarning.colorset/Contents.json
+++ b/Shared/Colors.xcassets/StatusWarning.colorset/Contents.json
@@ -5,8 +5,8 @@
       "color": {
         "color-space": "srgb",
         "components": {
-          "red": "0x7A",
-          "green": "0x56",
+          "red": "0xAD",
+          "green": "0x51",
           "blue": "0x00",
           "alpha": "1.000"
         }
@@ -24,7 +24,7 @@
         "color-space": "srgb",
         "components": {
           "red": "0xFF",
-          "green": "0xD6",
+          "green": "0x9F",
           "blue": "0x0A",
           "alpha": "1.000"
         }
@@ -41,8 +41,8 @@
       "color": {
         "color-space": "srgb",
         "components": {
-          "red": "0x5C",
-          "green": "0x41",
+          "red": "0x8A",
+          "green": "0x3F",
           "blue": "0x00",
           "alpha": "1.000"
         }
@@ -64,8 +64,8 @@
         "color-space": "srgb",
         "components": {
           "red": "0xFF",
-          "green": "0xE5",
-          "blue": "0x66",
+          "green": "0xBF",
+          "blue": "0x5C",
           "alpha": "1.000"
         }
       }
diff --git a/Shared/Colors.xcassets/StatusWarningSurface.colorset/Contents.json b/Shared/Colors.xcassets/StatusWarningSurface.colorset/Contents.json
new file mode 100644
index 0000000..8030a19
--- /dev/null
+++ b/Shared/Colors.xcassets/StatusWarningSurface.colorset/Contents.json
@@ -0,0 +1,78 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xFB",
+          "green": "0xEC",
+          "blue": "0xDF",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x2E",
+          "green": "0x1F",
+          "blue": "0x08",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xF7",
+          "green": "0xE0",
+          "blue": "0xC9",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        },
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x3D",
+          "green": "0x2A",
+          "blue": "0x0B",
+          "alpha": "1.000"
+        }
+      }
+    }
+  ],
+  "info": {
+    "author": "xcode",
+    "version": 1
+  }
+}