feat: In-app note-taking during recordings

[ruzin]

Description

Add a lightweight note-taking panel that lets users jot down notes, timestamps, and markers while a recording is in progress. Notes are saved alongside the transcript and included in the summary.

Context

Currently, StenoAI is a passive recorder -- the user starts a recording, stops it, and then reviews the generated transcript and summary. There's no way to annotate the recording in real-time. Users often want to flag important moments, add context the microphone can't capture (e.g., "whiteboard diagram discussed here"), or write their own thoughts alongside the automated transcript.

Requirements

• Add a note-taking text area in the Electron app's recording view
• Support timestamped notes: each note entry is associated with the elapsed recording time
• Support quick-markers / bookmarks: a single-click button to drop a timestamp marker (e.g., "Important moment at 12:34")
• Persist notes to the meeting's data file (MeetingTranscript model in src/models.py) -- add a notes field
• Include user notes as context in the summarization prompt so the LLM can reference them
• Display notes alongside the transcript in the meeting detail view after processing
• Notes should be included in Markdown exports

Design Considerations

• Keep it minimal -- this is a companion to the transcript, not a full rich-text editor
• Plain text with optional Markdown formatting is sufficient
• Consider keyboard shortcuts for adding a timestamped note without leaving the recording flow
• The note panel should not interfere with the audio recording UI

Notes

• This is distinct from the existing scribe template system (src/templates.py) which structures the LLM's output -- this feature captures the user's own input during the meeting
• Timestamped notes could later be combined with real-time transcription (feat: Real-time transcription during recording #20) to show notes inline with the live transcript