demux: solidify sink — reuse canonical primitives, fix 3 bugs

Delete re-implementations in the demux:// sink and wire to proven helpers;
keep only genuinely-new functionality.

- AnnexB reframing: delete the sink's local length_prefixed_to_annexb (it
  break'd on a zero-length NAL, dropping the rest of the access unit) and
  call the canonical append_length_prefixed_as_annex_b in mux::hevc, which
  skips just the empty NAL.
- HEVC param sets: delete hvcc_param_sets; reuse hvcc_to_annex_b.
- avcC param sets: hoist as the new canonical avcc_to_annex_b in mux::hevc,
  next to hvcc_to_annex_b (the symmetry point); the sink calls it.
- PGS .sup: emit a synthetic clear display set (empty PCS + END) at
  pts + duration_ns so subtitles time out instead of lingering to EOF.
- TimelineContinuity: move verbatim into the shared mux::timeline module
  (with the prev_offset straggler-remap intact) and use it from both the
  MKV muxer and the demux sink; delete the sink's drifted TimelineRebase
  copy (which lacked the straggler branch).
- VobSub .idx: emit the conventional 'id: <lang2>, index: 0' line mkvmerge
  reads to assign the subtitle language; palette reuse unchanged.
- output(): seed DemuxOptions.base from title.playlist when non-empty.

New constants for the PGS clear-segment framing and avcC header cite the
public HDMV PGS (BD-ROM Part 3) and ISO/IEC 14496-15 specs.

Tests: a zero-length NAL mid-frame no longer truncates the AU; a frame with
duration_ns produces a .sup clear segment; existing demux tests stay green.

src/mux/mod.rs

@@ -88,6 +88,9 @@ pub(crate) mod network;
 pub(crate) mod null;
 pub(crate) mod ps;
 pub(crate) mod stdio;
+/// Shared clip-boundary timeline-continuity corrector (used by the MKV muxer
+/// and the `demux://` sink).
+pub(crate) mod timeline;
 pub(crate) mod ts;
 pub(crate) mod tsmux;