feat(a11y): semantic colour system (#21 phase 1)

Replaces every hard-coded colour with semantic asset colours that adapt to
light, dark, and Increase Contrast. Dark mode stays locked, so this is a
pure refactor: the audit reports the same findings before and after.

The accent is now blue rather than cyan, per the tech/DNS theme.

Why custom values rather than the system palette: every system colour
fails WCAG AA in light mode. Measured on white — systemYellow 1.51:1,
systemOrange 2.20:1, systemGreen 2.22:1, systemCyan 2.54:1, systemRed
3.55:1. All of them pass in dark mode, which is why the dark-locked app
looked fine, and why unlocking light mode was never a matter of deleting
.preferredColorScheme(.dark). Every new value clears 4.5:1 as text on its
page, its card, and its own 16% badge tint — the way AppStatusBadgeView
actually draws it.

The accent needed splitting in two. As text on a dark background it must
be light; as a fill behind a white label it must be dark. #4DA3FF reads
8.00:1 as text on black but 2.63:1 behind white text, so StatusInfo /
AccentColor cover the foreground role and AccentFill covers
.borderedProminent. AppOnAccent is the label colour for a solid fill and
flips by scheme.

Colours live in Shared/Colors.xcassets rather than the app catalog: the
Shared folder is already a synchronized group in all three targets, so
the widget and share extension pick the palette up with no project-file
surgery. AccentColor stays in the app catalog as the global tint — and is
now actually defined, having been an empty colorset that silently left
system controls rendering in stock blue while custom chrome used cyan.

Two deliberate visual changes: orange folds into StatusWarning and pink
into StatusCritical. They encoded the same severity as the colours they
now share, and both sites also carry a text label.

Audit findings drop 15 to 14, and one of the originals turned out to be
a phantom: the Inspect contrast failure was the Run button in its
disabled state, which WCAG 1.4.3 exempts. testInspectScreen now types a
domain first so the audit measures an enabled control. Findings also
carry the offending element now, so the remaining clipped-text items name
themselves ("No Portfolio Yet", "Search domains") instead of being
anonymous.

12 files changed, 784 insertions, 0 deletions

diff --git a/Shared/Colors.xcassets/AccentFill.colorset/Contents.json b/Shared/Colors.xcassets/AccentFill.colorset/Contents.json
new file mode 100644
index 0000000..ae20bb8
--- /dev/null
+++ b/Shared/Colors.xcassets/AccentFill.colorset/Contents.json
@@ -0,0 +1,78 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x00",
+          "green": "0x00",
+          "blue": "0xFF",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x00",
+          "green": "0x40",
+          "blue": "0xDD",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x00",
+          "green": "0x00",
+          "blue": "0xCC",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        },
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x00",
+          "green": "0x33",
+          "blue": "0xCC",
+          "alpha": "1.000"
+        }
+      }
+    }
+  ],
+  "info": {
+    "author": "xcode",
+    "version": 1
+  }
+}
diff --git a/Shared/Colors.xcassets/AppBackground.colorset/Contents.json b/Shared/Colors.xcassets/AppBackground.colorset/Contents.json
new file mode 100644
index 0000000..ac109ac
--- /dev/null
+++ b/Shared/Colors.xcassets/AppBackground.colorset/Contents.json
@@ -0,0 +1,38 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xFF",
+          "green": "0xFF",
+          "blue": "0xFF",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x00",
+          "green": "0x00",
+          "blue": "0x00",
+          "alpha": "1.000"
+        }
+      }
+    }
+  ],
+  "info": {
+    "author": "xcode",
+    "version": 1
+  }
+}
diff --git a/Shared/Colors.xcassets/AppOnAccent.colorset/Contents.json b/Shared/Colors.xcassets/AppOnAccent.colorset/Contents.json
new file mode 100644
index 0000000..ac109ac
--- /dev/null
+++ b/Shared/Colors.xcassets/AppOnAccent.colorset/Contents.json
@@ -0,0 +1,38 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xFF",
+          "green": "0xFF",
+          "blue": "0xFF",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x00",
+          "green": "0x00",
+          "blue": "0x00",
+          "alpha": "1.000"
+        }
+      }
+    }
+  ],
+  "info": {
+    "author": "xcode",
+    "version": 1
+  }
+}
diff --git a/Shared/Colors.xcassets/AppSeparator.colorset/Contents.json b/Shared/Colors.xcassets/AppSeparator.colorset/Contents.json
new file mode 100644
index 0000000..3f5960a
--- /dev/null
+++ b/Shared/Colors.xcassets/AppSeparator.colorset/Contents.json
@@ -0,0 +1,78 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xC6",
+          "green": "0xC6",
+          "blue": "0xC8",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x38",
+          "green": "0x38",
+          "blue": "0x3A",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xA0",
+          "green": "0xA0",
+          "blue": "0xA3",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        },
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x54",
+          "green": "0x54",
+          "blue": "0x56",
+          "alpha": "1.000"
+        }
+      }
+    }
+  ],
+  "info": {
+    "author": "xcode",
+    "version": 1
+  }
+}
diff --git a/Shared/Colors.xcassets/AppSurface.colorset/Contents.json b/Shared/Colors.xcassets/AppSurface.colorset/Contents.json
new file mode 100644
index 0000000..94ae3c7
--- /dev/null
+++ b/Shared/Colors.xcassets/AppSurface.colorset/Contents.json
@@ -0,0 +1,78 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xF2",
+          "green": "0xF2",
+          "blue": "0xF7",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x0E",
+          "green": "0x0E",
+          "blue": "0x0F",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xEB",
+          "green": "0xEB",
+          "blue": "0xF0",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        },
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x16",
+          "green": "0x16",
+          "blue": "0x18",
+          "alpha": "1.000"
+        }
+      }
+    }
+  ],
+  "info": {
+    "author": "xcode",
+    "version": 1
+  }
+}
diff --git a/Shared/Colors.xcassets/AppSurfaceElevated.colorset/Contents.json b/Shared/Colors.xcassets/AppSurfaceElevated.colorset/Contents.json
new file mode 100644
index 0000000..775eafb
--- /dev/null
+++ b/Shared/Colors.xcassets/AppSurfaceElevated.colorset/Contents.json
@@ -0,0 +1,78 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xE5",
+          "green": "0xE5",
+          "blue": "0xEA",
+          "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": "0xDC",
+          "green": "0xDC",
+          "blue": "0xE1",
+          "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/Contents.json b/Shared/Colors.xcassets/Contents.json
new file mode 100644
index 0000000..73c0059
--- /dev/null
+++ b/Shared/Colors.xcassets/Contents.json
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/Shared/Colors.xcassets/StatusCritical.colorset/Contents.json b/Shared/Colors.xcassets/StatusCritical.colorset/Contents.json
new file mode 100644
index 0000000..8f97cd9
--- /dev/null
+++ b/Shared/Colors.xcassets/StatusCritical.colorset/Contents.json
@@ -0,0 +1,78 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xB3",
+          "green": "0x26",
+          "blue": "0x1E",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xFF",
+          "green": "0x69",
+          "blue": "0x61",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x8C",
+          "green": "0x1D",
+          "blue": "0x16",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        },
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xFF",
+          "green": "0x9A",
+          "blue": "0x94",
+          "alpha": "1.000"
+        }
+      }
+    }
+  ],
+  "info": {
+    "author": "xcode",
+    "version": 1
+  }
+}
diff --git a/Shared/Colors.xcassets/StatusInfo.colorset/Contents.json b/Shared/Colors.xcassets/StatusInfo.colorset/Contents.json
new file mode 100644
index 0000000..9d1e3b9
--- /dev/null
+++ b/Shared/Colors.xcassets/StatusInfo.colorset/Contents.json
@@ -0,0 +1,78 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x00",
+          "green": "0x00",
+          "blue": "0xFF",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x4D",
+          "green": "0xA3",
+          "blue": "0xFF",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x00",
+          "green": "0x00",
+          "blue": "0xCC",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        },
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x7F",
+          "green": "0xBF",
+          "blue": "0xFF",
+          "alpha": "1.000"
+        }
+      }
+    }
+  ],
+  "info": {
+    "author": "xcode",
+    "version": 1
+  }
+}
diff --git a/Shared/Colors.xcassets/StatusNeutral.colorset/Contents.json b/Shared/Colors.xcassets/StatusNeutral.colorset/Contents.json
new file mode 100644
index 0000000..9e7bb36
--- /dev/null
+++ b/Shared/Colors.xcassets/StatusNeutral.colorset/Contents.json
@@ -0,0 +1,78 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x5A",
+          "green": "0x5A",
+          "blue": "0x5F",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xA1",
+          "green": "0xA1",
+          "blue": "0xA6",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x3A",
+          "green": "0x3A",
+          "blue": "0x3C",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        },
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xC7",
+          "green": "0xC7",
+          "blue": "0xCC",
+          "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
new file mode 100644
index 0000000..22ce5e5
--- /dev/null
+++ b/Shared/Colors.xcassets/StatusPositive.colorset/Contents.json
@@ -0,0 +1,78 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x14",
+          "green": "0x6C",
+          "blue": "0x2E",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x30",
+          "green": "0xD1",
+          "blue": "0x58",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x0B",
+          "green": "0x50",
+          "blue": "0x23",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        },
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x5B",
+          "green": "0xE5",
+          "blue": "0x84",
+          "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
new file mode 100644
index 0000000..cc79e86
--- /dev/null
+++ b/Shared/Colors.xcassets/StatusWarning.colorset/Contents.json
@@ -0,0 +1,78 @@
+{
+  "colors": [
+    {
+      "idiom": "universal",
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x7A",
+          "green": "0x56",
+          "blue": "0x00",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xFF",
+          "green": "0xD6",
+          "blue": "0x0A",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0x5C",
+          "green": "0x41",
+          "blue": "0x00",
+          "alpha": "1.000"
+        }
+      }
+    },
+    {
+      "idiom": "universal",
+      "appearances": [
+        {
+          "appearance": "luminosity",
+          "value": "dark"
+        },
+        {
+          "appearance": "contrast",
+          "value": "high"
+        }
+      ],
+      "color": {
+        "color-space": "srgb",
+        "components": {
+          "red": "0xFF",
+          "green": "0xE5",
+          "blue": "0x66",
+          "alpha": "1.000"
+        }
+      }
+    }
+  ],
+  "info": {
+    "author": "xcode",
+    "version": 1
+  }
+}