docs: add some docs

docs/user/features.md

@@ -27,8 +27,28 @@ This document lists features that are implemented in the current codebase.
 
 ## Audio
 
-- One-shot sound playback for trigger interactions
-- Simple per-sound pooling through `AudioManager`
+- Category-based volumes for music, SFX, and dialogue
+- Looped background music playback through `AudioManager`
+- One-shot sound playback for SFX and dialogue, with simple per-sound pooling
+- Optional stereo pan for one-shot sounds
+
+## Dialogue And Subtitles
+
+- Dialogue manifest in `public/sounds/dialogue/dialogues.json`
+- Dialogue audio loaded from `public/sounds/dialogue/`
+- One SRT subtitle file per voice and language
+- French subtitle fallback when the selected language file is missing
+- Runtime subtitle overlay with speaker-specific colors
+- Timecoded dialogue trigger support for dialogue entries that define `timecode`
+
+## Game Options Menu
+
+- `Esc` opens and closes the in-game options menu
+- Music, SFX, and dialogue volume sliders
+- Subtitle visibility toggle
+- Subtitle language choice between French and English
+- Repair runtime choice between local JavaScript and Python server mode
+- Quit action that clears browser-accessible cookies and returns to `/`
 
 ## Debug Tooling
 
@@ -52,13 +72,17 @@ This document lists features that are implemented in the current codebase.
 - Player-style navigation mode with `WASD`, `ZQSD`, arrow keys, `Space`, and `Shift`
 - JSON export for downloading the edited map
 - Dev-server save endpoint for writing changes back to `public/map.json`
+- SRT editor for dialogue subtitles
+- Audio preview and timing helpers for SRT cues
+- Dev-server save endpoint for SRT files
+- Dialogue manifest validation from the editor UI
 
 ## Not Implemented Yet
 
 - mission system
 - zone system
 - cinematic system
-- dialogue system
+- dialogue queueing and gameplay-triggered dialogue branches
 - loading flow
 - minimap and mission HUD
 - full production separation between gameplay and debug scenes