fix(node,hub): HEVC transcode fallback, live-add progress, per-group TMDB toggle

Three bugs found live testing the Videos app against a real HEVC/EAC3 show,
plus a design change requested afterward:

- Streaming always did "-c:v copy", which faithfully reports a source's real
  hev1 codec string but is unplayable in a browser with no HEVC decoder
  (most Chrome/Linux builds). The node now transcodes to H264 whenever the
  probed codec is browser-incompatible (media_probe.py's new
  BROWSER_INCOMPATIBLE_VIDEO_CODECS), with a `transcode_incompatible_video`
  node.toml opt-out for operators who know their viewers already decode it.

- Dropping a whole season into an already-watched folder gave no scanning
  indicator and no progress bar: IndexProgress was only ever updated by the
  two bulk scan paths, never by the real-time per-file watchdog path
  (_schedule_update/_debounce/_update_entry). That path now accounts a
  "burst" the same way, without double-counting a file rewritten mid-debounce.

- A stray literal "0" rendered in the video detail modal when there was no
  TMDB match (`meta.confidence` is 0, and `0 && x` renders "0" in JSX/htm,
  not nothing) — `confident` is now a real boolean.

- Whether TMDB is used at all moves from a node-wide setting to per-group
  (OP_TMDB_ENABLED/tmdb_enabled/tmdb_enabled_ack, scoped like OP_VIDEO_ROOT):
  an operator running a real media-library group alongside test/demo groups
  on one node wants outbound TMDB traffic for the one that needs it, not all
  of them. The custom API token and query language stay node-wide, one
  shared credential/cache (tmdb_config/OP_TMDB_CONFIG, unchanged reasoning).
  MNP_VERSION 0.6 -> 0.7, additive.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LAmyXtc6dAADsH23ydXQpY

1 files changed, 3 insertions, 24 deletions

diff --git a/packages/meshbay-node/tests/test_tmdb.py b/packages/meshbay-node/tests/test_tmdb.py
index 4500feb..fcbc2a2 100644
--- a/packages/meshbay-node/tests/test_tmdb.py
+++ b/packages/meshbay-node/tests/test_tmdb.py
@@ -7,14 +7,12 @@ from meshbay_node.tmdb import TmdbClient
 
 
 class FakeRoster:
-    def __init__(self, enabled: bool = True, token: str | None = "fake-token",
-                 language: str | None = None):
-        self._enabled = enabled
+    def __init__(self, token: str | None = "fake-token", language: str | None = None):
         self._token = token
         self._language = language
 
     async def tmdb_config(self):
-        return self._enabled, self._token, self._language
+        return self._token, self._language
 
 
 def _handler(response_map):
@@ -106,25 +104,6 @@ async def test_no_results_returns_none_and_zero_confidence():
 
 
 @pytest.mark.asyncio
-async def test_disabled_via_roster_setting_makes_no_request():
-    calls = []
-
-    def handle(request: httpx.Request) -> httpx.Response:
-        calls.append(request)
-        return httpx.Response(200, json={"results": []})
-
-    client = TmdbClient(
-        roster=FakeRoster(enabled=False),
-        transport=httpx.MockTransport(handle),
-    )
-    result, ratio = await client.search_movie("Anything")
-
-    assert result is None
-    assert calls == []   # confirms the disabled check short-circuits before any request
-    await client.close()
-
-
-@pytest.mark.asyncio
 async def test_no_token_resolvable_makes_no_request(monkeypatch):
     monkeypatch.delenv("MESHBAY_TMDB_DEFAULT_TOKEN", raising=False)
     calls = []
@@ -134,7 +113,7 @@ async def test_no_token_resolvable_makes_no_request(monkeypatch):
         return httpx.Response(200, json={"results": []})
 
     client = TmdbClient(
-        roster=FakeRoster(enabled=True, token=None),
+        roster=FakeRoster(token=None),
         transport=httpx.MockTransport(handle),
     )
     result, ratio = await client.search_movie("Anything")