feat(desktop): send meeting transcript segments and preset prompt edits to the phone

The phone draws a meeting from its transcript segments before the edited
transcript, so desktop edits, auto-polish and diarization never showed there.
Every desktop transcript change now rebuilds the meeting's segments from its
[MM:SS] [speaker] lines and trims the rest; the line parser moves to
@d3ro/core/meeting-transcript and the meeting view uses it too.

Prompt edits of the four desktop presets that exist on the phone update the
server preset row (a reset restores its default; {{targetLanguage}} is sent
as English, the only target on both sides), and edits made on another desktop
come back. The free-prompt preset has no phone counterpart and stays local.

packages/core/package.json

@@ -42,6 +42,10 @@
       "types": "./src/caption-streaming.ts",
       "default": "./src/caption-streaming.ts"
     },
+    "./meeting-transcript": {
+      "types": "./src/meeting-transcript.ts",
+      "default": "./src/meeting-transcript.ts"
+    },
     "./entitlement": {
       "types": "./src/entitlement.ts",
       "default": "./src/entitlement.ts"