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, 1 deletions

diff --git a/packages/meshbay-common/src/meshbay_common/protocol.py b/packages/meshbay-common/src/meshbay_common/protocol.py
index 900acc2..32dc373 100644
--- a/packages/meshbay-common/src/meshbay_common/protocol.py
+++ b/packages/meshbay-common/src/meshbay_common/protocol.py
@@ -94,8 +94,10 @@ class MNP:
     MEDIA_META_RESP       = "media_meta_resp"       # node → client: TMDB metadata (or none)
     VIDEO_ROOT            = "video_root"             # operator → node: which folder is the Videos entry point
     VIDEO_ROOT_ACK        = "video_root_ack"
-    TMDB_CONFIG           = "tmdb_config"            # operator → node: enable/disable TMDB, set token
+    TMDB_CONFIG           = "tmdb_config"            # operator → node: set custom TMDB token/language (node-wide)
     TMDB_CONFIG_ACK       = "tmdb_config_ack"        # node → everyone: new TMDB config (never the token)
+    TMDB_ENABLED          = "tmdb_enabled"           # operator → node: enable/disable TMDB for this group
+    TMDB_ENABLED_ACK      = "tmdb_enabled_ack"       # node → this group: new per-group TMDB enabled state
     SEASON_META_REQ       = "season_meta_req"        # client → node: TMDB overview/poster for one season
     SEASON_META_RESP      = "season_meta_resp"       # node → client: season-level TMDB fields (or none)
     TMDB_SEARCH_REQ       = "tmdb_search_req"        # client → node: candidate TMDB matches for a query