Add menu testing script and troubleshooting documentation

docs/MENU_TROUBLESHOOTING.md

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+# MPV Menu Troubleshooting & Fix Summary
+
+## Problem
+Right-clicking in MPV wasn't opening the menu as expected.
+
+## Root Cause
+UOSC (the UI overlay script for MPV) claims the `mbtn_right` (right-click) event globally with the `force` flag after loading, which overrides:
+- MPV's default input.conf bindings  
+- Lua keybindings registered via `mp.add_key_binding()`
+
+UOSC defines its own right-click menu, and there's no straightforward way to override it from a script.
+
+## Current Solution
+
+### Primary Menu Triggers
+1. **Press 'm' key** - Opens the Medios Macina menu
+2. **Press 'z' key** - Alternative menu trigger
+3. **Right-click** - Attempts to trigger via input.conf, but UOSC overrides (needs investigation)
+
+### How It Works
+- `MPV/portable_config/input.conf` routes keybindings to Lua handlers
+- `MPV/LUA/main.lua`:
+  - Registers script message handler: `medios-show-menu` 
+  - Registers Lua keybindings for 'm' and 'z' keys
+  - Both route to `M.show_menu()` which opens an UOSC menu with items
+
+### Menu Structure
+The menu calls UOSC's `open-menu` handler with JSON containing:
+- Load URL
+- Get Metadata  
+- Delete File
+- Cmd (screenshot, trim, etc)
+- Download
+- Change Format
+- Start Helper (if not running)
+
+## Files Modified
+- `MPV/LUA/main.lua`:
+  - Fixed Lua syntax error (extra `end)`)
+  - Added comprehensive `[MENU]` and `[KEY]` logging
+  - Added 'm' and 'z' keybindings
+  - Added `medios-show-menu` script message handler
+  - Enhanced `M.show_menu()` with dual methods to call UOSC
+
+- `MPV/portable_config/input.conf`:
+  - Routes `mbtn_right` to `script-message medios-show-menu`
+  - Routes 'm' key to `script-message medios-show-menu`
+
+- `MPV/portable_config/mpv.conf`:
+  - Fixed `audio-display` setting (was invalid `yes`, now `no`)
+
+## Testing
+Run: `python test_menu.py`
+
+Or manually:
+1. Start MPV with: `mpv --script=MPV/LUA/main.lua --config-dir=MPV/portable_config --idle`
+2. Press 'm' or 'z' key
+3. Check logs at `Log/medeia-mpv-lua.log` for `[MENU]` entries
+
+## Next Steps
+To properly support right-click:
+1. Investigate UOSC's context menu configuration
+2. See if UOSC has a hook to add custom menu items to its context menu
+3. Or implement a workaround by disabling UOSC's right-click handler
+
+## Logs to Check
+- `Log/medeia-mpv-lua.log` - Lua script logs with [MENU], [KEY], [input.conf] tags
+- `Log/medeia-mpv-helper.log` - Pipeline helper logs
+- Check MPV debug log with: `mpv --log-file=mpv_debug.log --msg-level="all=debug"`