对齐有线传图页 Android UI，并改用相对路径持久化本地照片。

还原顶栏、浮动卡片、时间侧栏与底部交互；照片路径改为 CameraDownloads 相对路径并兼容旧数据；格式 Chip 固定 JPG 且不可点击。

Co-authored-by: Cursor <cursoragent@cursor.com>

suixinkanTests/CameraTethering/CameraDownloadStorageTests.swift

@@ -0,0 +1,47 @@
+//
+//  CameraDownloadStorageTests.swift
+//  suixinkanTests
+//
+
+import XCTest
+@testable import suixinkan
+
+/// CameraDownloadStorage 相对路径持久化测试。
+final class CameraDownloadStorageTests: XCTestCase {
+    /// 测试相对路径前缀。
+    func testRelativePathUsesCameraDownloadsPrefix() {
+        let fileURL = CameraDownloadStorage.downloadsDirectory.appendingPathComponent("1730_test.JPG")
+        XCTAssertEqual(CameraDownloadStorage.relativePath(for: fileURL), "CameraDownloads/1730_test.JPG")
+    }
+
+    /// 测试相对路径解析。
+    func testResolveLocalURLFromRelativePath() {
+        let stored = "CameraDownloads/1730_test.JPG"
+        let resolved = CameraDownloadStorage.resolveLocalURL(from: stored)
+        let expected = CameraDownloadStorage.documentsDirectory.appendingPathComponent(stored)
+        XCTAssertEqual(resolved, expected)
+    }
+
+    /// 测试旧版绝对路径迁移。
+    func testMigrateStoredPathFromLegacyAbsolutePath() throws {
+        let fileURL = CameraDownloadStorage.uniqueLocalURL(for: "legacy.jpg")
+        try Data("jpeg".utf8).write(to: fileURL)
+        defer { try? FileManager.default.removeItem(at: fileURL) }
+
+        let migrated = CameraDownloadStorage.migrateStoredPath(fileURL.path)
+        XCTAssertEqual(migrated, "CameraDownloads/\(fileURL.lastPathComponent)")
+        XCTAssertEqual(CameraDownloadStorage.resolveLocalURL(from: migrated ?? "")?.path, fileURL.path)
+    }
+
+    /// 测试预览 URL 字符串生成。
+    func testPreviewURLStringFromRelativePath() throws {
+        let fileURL = CameraDownloadStorage.uniqueLocalURL(for: "preview.jpg")
+        try Data("jpeg".utf8).write(to: fileURL)
+        defer { try? FileManager.default.removeItem(at: fileURL) }
+
+        let stored = CameraDownloadStorage.relativePath(for: fileURL)
+        let preview = CameraDownloadStorage.previewURLString(from: stored)
+        XCTAssertFalse(preview.isEmpty)
+        XCTAssertTrue(preview.hasPrefix("file://"))
+    }
+}