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, 11 insertions, 2 deletions

diff --git a/packages/meshbay-hub/src/meshbay_hub/static/group-page.js b/packages/meshbay-hub/src/meshbay_hub/static/group-page.js
index 55f8e36..aa6b29c 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/group-page.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/group-page.js
@@ -207,7 +207,9 @@ function GroupPage({ groupId, group, token, username, userId, userPrefs,
         setEnabledApps(ack.enabled_apps || null);
         setScanSettings(ack.scan_settings || null);
         setTmdbConfig({
+          // Per-group (2026-08-24, used to be node-wide).
           enabled: ack.tmdb_enabled !== false,
+          // Node-wide — one shared credential/cache.
           tokenCustomized: !!ack.tmdb_token_customized,
           language: ack.tmdb_language || '',
         });
@@ -217,7 +219,13 @@ function GroupPage({ groupId, group, token, username, userId, userPrefs,
         // and a button that is still there is a button people press.
         transport.onUploadPolicy = (allowed) => setMemberUpload(allowed);
         transport.onAppsEnabled = (apps) => setEnabledApps(apps);
-        transport.onTmdbConfig = (cfg) => setTmdbConfig(cfg);
+        // Two independent acks now (tmdb_config_ack: token/language,
+        // node-wide; tmdb_enabled_ack: the per-group switch) — each merges
+        // its own slice into the one tmdbConfig object rather than
+        // replacing it, so one changing does not clobber the other's most
+        // recent value.
+        transport.onTmdbConfig = (cfg) => setTmdbConfig((prev) => ({ ...(prev || {}), ...cfg }));
+        transport.onTmdbEnabled = (enabled) => setTmdbConfig((prev) => ({ ...(prev || {}), enabled }));
         transport.onVideoRoot = (path) => setVideoRoot(path);
         // The node's own scan (a root added while we were already connected,
         // or reconcile catching one back up) — never the entries, just
@@ -524,7 +532,8 @@ function GroupPage({ groupId, group, token, username, userId, userPrefs,
             scanSettings=${scanSettings}
             onScanSettings=${(s) => setScanSettings(s)}
             tmdbConfig=${tmdbConfig}
-            onTmdbConfig=${(cfg) => setTmdbConfig(cfg)}
+            onTmdbConfig=${(cfg) => setTmdbConfig((prev) => ({ ...(prev || {}), ...cfg }))}
+            onTmdbEnabled=${(enabled) => setTmdbConfig((prev) => ({ ...(prev || {}), enabled }))}
             entries=${entries} nodeDirs=${nodeDirs}
             videoRoot=${videoRoot}
             onVideoRoot=${(path) => setVideoRoot(path)}