Channels layout improvements, other UI fixes

Shared Tests/Extensions/Int+FormatTests.swift

@@ -0,0 +1,19 @@
+import XCTest
+
+final class IntFormatTests: XCTestCase {
+    func testFormattedAsAbbreviation() throws {
+        let samples: [Int: String] = [
+            1: "1",
+            999: "999",
+            1000: "1K",
+            1101: "1,1K",
+            12345: "12,3K",
+            123_456: "123,5K",
+            123_626_789: "123,6M"
+        ]
+
+        samples.forEach { value, formatted in
+            XCTAssertEqual(value.formattedAsAbbreviation(), formatted)
+        }
+    }
+}