create KEYBINDS.md

KEYBINDS.md

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+# Keybinds
+
+## Grid
+
+| Key | Action |
+|-----|--------|
+| Arrow keys / `h`/`j`/`k`/`l` | Navigate grid |
+| `Ctrl+A` | Select all |
+| `Ctrl+Click` / `Shift+Click` | Multi-select |
+| `Home` / `End` | Jump to first / last |
+| Scroll tilt left / right | Previous / next thumbnail (one cell) |
+| `Ctrl+C` | Copy file to clipboard |
+| Right click | Context menu |
+
+## Preview
+
+| Key | Action |
+|-----|--------|
+| Scroll wheel | Zoom (image) / volume (video) |
+| Scroll tilt left / right | Previous / next post |
+| Middle click / `0` | Reset view |
+| Arrow keys / `h`/`j`/`k`/`l` | Navigate posts |
+| `,` / `.` | Seek 3s back / forward (video) |
+| `Space` | Play / pause (video, hover to activate) |
+| Right click | Context menu (bookmark, save, popout) |
+
+## Popout
+
+| Key | Action |
+|-----|--------|
+| Arrow keys / `h`/`j`/`k`/`l` | Navigate posts |
+| Scroll tilt left / right | Previous / next post |
+| `,` / `.` | Seek 3s (video) |
+| `Space` | Play / pause (video) |
+| Scroll wheel | Volume up / down (video) |
+| `F11` | Toggle fullscreen / windowed |
+| `Ctrl+H` | Hide / show UI |
+| `Ctrl+P` | Privacy screen |
+| `Escape` / `Q` | Close popout |
+
+## Global
+
+| Key | Action |
+|-----|--------|
+| `Ctrl+P` | Privacy screen |
+| `F11` | Toggle fullscreen |