feat: add KeePassIconMapper (iconIndex -> SF Symbol)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WYqycDFsynHH9VnnK7LNSf

MyPassCore/Sources/MyPassCore/Icons/KeePassIconMapper.swift

@@ -0,0 +1,34 @@
+import Foundation
+
+/// Maps KeePass's standard icon palette (indices 0-68) to an approximate SF Symbol.
+/// This is a best-effort visual match, not the actual KeePass icon artwork -- MyPass's
+/// data model only stores the numeric iconIndex, not custom icon images.
+public enum KeePassIconMapper {
+    private static let symbolsByIndex: [Int: String] = [
+        0: "key.fill",
+        1: "globe",
+        2: "exclamationmark.triangle.fill",
+        3: "server.rack",
+        4: "doc.on.clipboard.fill",
+        5: "pencil",
+        6: "camera.fill",
+        7: "wrench.fill",
+        8: "person.text.rectangle.fill",
+        9: "externaldrive.fill",
+        10: "creditcard.fill",
+        11: "chevron.left.forwardslash.chevron.right",
+        12: "chart.bar.fill",
+        13: "gamecontroller.fill",
+        14: "envelope.fill",
+        15: "folder.fill",
+        16: "lock.fill",
+        17: "checkmark.circle.fill",
+        18: "star.fill",
+        19: "house.fill",
+        20: "network",
+    ]
+
+    public static func symbolName(forIconIndex index: Int) -> String {
+        symbolsByIndex[index] ?? "key.fill"
+    }
+}

MyPassCore/Tests/MyPassCoreTests/KeePassIconMapperTests.swift

@@ -0,0 +1,16 @@
+import XCTest
+@testable import MyPassCore
+
+final class KeePassIconMapperTests: XCTestCase {
+    func test_knownIndex_returnsMappedSymbol() {
+        XCTAssertEqual(KeePassIconMapper.symbolName(forIconIndex: 14), "envelope.fill")
+    }
+
+    func test_indexZero_isKeyFill() {
+        XCTAssertEqual(KeePassIconMapper.symbolName(forIconIndex: 0), "key.fill")
+    }
+
+    func test_unmappedIndex_fallsBackToKeyFill() {
+        XCTAssertEqual(KeePassIconMapper.symbolName(forIconIndex: 999), "key.fill")
+    }
+}