Remove embedded music player

The music feature is retired: delete the Media tab, MediaAPI,
MediaPlayerController, PinnedMediaResourceLoader, MediaPanelView, the
media_state control publish, media scope handling in VoiceSession, the
volume setting, and all media tests. App is now Talk + Activity tabs.

Backend media API in hope-voice-api is untouched (still serves the web UI).

UITests/VoiceLiveTests.swift

@@ -1,9 +1,8 @@
 import XCTest
 
-/// Opt-in tests against the actual NAS deployment. No injected replies or media.
+/// Opt-in tests against the actual NAS deployment. No injected replies.
 final class VoiceLiveTests: XCTestCase {
     private var app: XCUIApplication!
-    private var startedMusic = false
 
     override func record(_ issue: XCTIssue) {
         if let app, app.state == .runningForeground {
@@ -17,20 +16,13 @@ final class VoiceLiveTests: XCTestCase {
     }
 
     override func tearDownWithError() throws {
-        defer { app?.terminate() }
-        guard let app, app.state == .runningForeground else { return }
-        // Stop only playback initiated by this test, including assertion failures.
-        // Do not leave the shared default room playing between test runs.
-        if startedMusic, app.buttons["Stop playback"].exists {
-            app.buttons["Stop playback"].tap()
-        }
+        app?.terminate()
     }
 
     override func setUpWithError() throws {
         try XCTSkipUnless(ProcessInfo.processInfo.environment["HOPE_RUN_LIVE_TESTS"] == "1", "Requires the live Hope server")
         continueAfterFailure = false
         app = XCUIApplication()
-        startedMusic = false
         app.launchArguments = ["--ui-testing", "--reset-ui-testing", "--live-testing"]
         app.launch()
     }
@@ -63,31 +55,6 @@ final class VoiceLiveTests: XCTestCase {
         XCTAssertTrue(app.buttons["Start chatting"].waitForExistence(timeout: 20))
     }
 
-    func testLiveLibraryPlayback() {
-        app.tabBars.buttons["Music"].tap()
-        let play = app.buttons.matching(NSPredicate(format: "label BEGINSWITH 'Play Sheryl Crow'")).firstMatch
-        XCTAssertTrue(play.waitForExistence(timeout: 20), "Existing library must load from NAS")
-        startedMusic = true
-        play.tap()
-        XCTAssertTrue(app.buttons["Pause"].waitForExistence(timeout: 30))
-        // Elapsed media time proves AVPlayer decoded and advanced, beyond a server desired-state label.
-        let position = app.sliders["Playback position"]
-        XCTAssertTrue(position.waitForExistence(timeout: 10))
-        let advanced = NSPredicate { _, _ in
-            let value = position.value as? String ?? "0%"
-            return value != "0%" && value != "0" && !value.isEmpty
-        }
-        expectation(for: advanced, evaluatedWith: position)
-        waitForExpectations(timeout: 35)
-        app.buttons["Pause"].tap()
-        XCTAssertTrue(app.buttons["Play"].waitForExistence(timeout: 10))
-        app.buttons["Seek forward 10 seconds"].tap()
-        capture("Live music playback")
-        app.buttons["Stop playback"].tap()
-        XCTAssertFalse(app.buttons["Pause"].exists)
-        startedMusic = false
-    }
-
     private func capture(_ name: String) {
         let attachment = XCTAttachment(screenshot: app.screenshot())
         attachment.name = name

UITests/VoiceUITests.swift

@@ -48,29 +48,6 @@ final class VoiceUITests: XCTestCase {
         XCTAssertEqual(app.textFields["Server URL"].value as? String, "https://127.0.0.1:1")
     }
 
-    func testMusicSearchAndStationValidation() {
-        app.launch()
-        app.tabBars.buttons["Music"].tap()
-        XCTAssertTrue(app.buttons["Add radio station"].waitForExistence(timeout: 5))
-        XCTAssertTrue(app.staticTexts["Music server unavailable"].waitForExistence(timeout: 10))
-        app.segmentedControls.buttons["Search"].tap()
-        let query = app.textFields["Song, artist, lyrics…"]
-        query.tap()
-        query.typeText("Piano")
-        app.buttons["music.search"].tap()
-        XCTAssertTrue(app.staticTexts.matching(NSPredicate(format: "label CONTAINS 'connect to the server'")).firstMatch.waitForExistence(timeout: 15))
-        app.buttons["Add radio station"].tap()
-        let url = app.textFields["Audio stream URL"]
-        XCTAssertTrue(url.waitForExistence(timeout: 5))
-        url.tap()
-        url.typeText("not-a-url")
-        app.buttons["Add station"].tap()
-        XCTAssertTrue(app.staticTexts["Enter a complete http:// or https:// audio stream address."].exists)
-        app.buttons["Cancel"].tap()
-        XCTAssertTrue(app.buttons["Add radio station"].exists)
-        capture("Music search")
-    }
-
     func testTranscriptClearConfirmationAndActivityDetails() {
         app.launchArguments.append("--ui-fixtures")
         app.launch()