fix(playback): Avoid MPD manifest parsing to fix regression with new TIDAL group="main" manifests

TIDAL appears to have changed the MPEG-DASH MPD manifests returned for
some streams to include non-numeric values in
`<AdaptationSet group="...">` (e.g. group="main").

The current `mpegdash` parser expects group to be an integer and raises
a `ValueError`, which `tidalapi` wraps as `ManifestDecodeError`. This
caused `mopidy-tidal` playback to fail and tracks to be marked “not
playable”.

This PR updates mopidy-tidal’s playback provider to avoid parsing MPD
manifests via tidalapi/mpegdash.

For MPD manifests we only need to persist the MPD XML and return a
`file://` URI, so parsing is unnecessary.

**Root cause**

- [`tidalapi.StreamManifest`](https://github.com/EbbLabs/python-tidal/blob/08742362ee8cef7df1362387cef60c2846aa84ee/tidalapi/media.py#L644) → [`DashInfo.from_mpd()`](https://github.com/EbbLabs/python-tidal/blob/08742362ee8cef7df1362387cef60c2846aa84ee/tidalapi/media.py#L770) → `mpegdash` parser

- New MPD contains: `<AdaptationSet ... group="main" ...>`

- [`mpegdash` tries to parse group as int](https://github.com/sangwonl/python-mpegdash/blob/48b52122cdbcaebe1804b79f77d05dfc1ce32900/mpegdash/nodes.py#L782) → `ValueError` → `tidalapi.exceptions.ManifestDecodeError`

- Mopidy logs: backend exception + _Track is not playable_

**Changes**

- **MPD path** (`ManifestMimeType.MPD`)
    - Stop calling `stream.get_stream_manifest()` (this triggers MPD
      parsing and the crash)
    - Use `stream.get_manifest_data()` to fetch raw MPD XML
    - Write the MPD to `manifest.mpd` in the extension cache directory
    - Return `file://…/manifest.mpd` for playback (same end result as
      before, but without parsing)
- **BTS path** (ManifestMimeType.BTS)
    - Keep existing behavior using stream.get_stream_manifest()

**Why this is safe**

mopidy-tidal already ultimately plays MPD by writing it to disk and
handing Mopidy a `file://` URI.

The parsed MPD data from tidalapi wasn’t required for playback logic
here; it was effectively only used for logging (codecs).

Closes: EbbLabs/python-tidal#397

Author: blacklight

mopidy_tidal/playback.py

@@ -38,19 +38,18 @@ def translate_uri(self, uri):
                 )
 
         stream = session.track(track_id).get_stream()
-        manifest = stream.get_stream_manifest()
         logger.info("MimeType:{}".format(stream.manifest_mime_type))
-        logger.info(
-            "Starting playback of track:{}, (quality:{}, codec:{}, {}bit/{}Hz)".format(
-                track_id,
-                stream.audio_quality,
-                manifest.get_codecs(),
-                stream.bit_depth,
-                stream.sample_rate,
-            )
-        )
 
         if stream.manifest_mime_type == ManifestMimeType.MPD:
+            logger.info(
+                "Starting playback of track:{}, (quality:{}, {}bit/{}Hz)".format(
+                    track_id,
+                    stream.audio_quality,
+                    stream.bit_depth,
+                    stream.sample_rate,
+                )
+            )
+
             data = stream.get_manifest_data()
             if data:
                 mpd_path = Path(
@@ -63,4 +62,18 @@ def translate_uri(self, uri):
             else:
                 raise AttributeError("No MPD manifest available!")
         elif stream.manifest_mime_type == ManifestMimeType.BTS:
-            return manifest.get_urls()
+            manifest = stream.get_stream_manifest()
+            logger.info(
+                "Starting playback of track:{}, (quality:{}, codec:{}, {}bit/{}Hz)".format(
+                    track_id,
+                    stream.audio_quality,
+                    manifest.get_codecs(),
+                    stream.bit_depth,
+                    stream.sample_rate,
+                )
+            )
+            urls = manifest.get_urls()
+            if isinstance(urls, list):
+                return urls[0]
+            else:
+                return urls