docs(faq): add keyboard shortcuts documentation for Hyprnote (#2192)

Author: ComputelessComputer

apps/web/content/docs/faq/6.keyboard-shortcuts.mdx

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+---
+title: "Keyboard Shortcuts"
+section: "FAQ"
+description: "Complete list of keyboard shortcuts in Hyprnote."
+---
+
+## Navigation
+
+| Shortcut | Action |
+|----------|--------|
+| <kbd>⌘</kbd> + <kbd>1</kbd>, <kbd>2</kbd>, <kbd>3</kbd>, ... | Switch to specific outer tab |
+| <kbd>⌘</kbd> + <kbd>⌥</kbd> + <kbd>←</kbd> / <kbd>→</kbd> | Navigate to next/previous outer tab |
+| <kbd>⌃</kbd> + <kbd>⌥</kbd> + <kbd>←</kbd> / <kbd>→</kbd> | Navigate to next/previous inner tab |
+
+## Sidebar & Panels
+
+| Shortcut | Action |
+|----------|--------|
+| <kbd>⌘</kbd> + <kbd>\\</kbd> | Toggle left sidebar |
+| <kbd>⌘</kbd> + <kbd>J</kbd> | Toggle AI assistant |
+
+## Notes & Tabs
+
+| Shortcut | Action |
+|----------|--------|
+| <kbd>⌘</kbd> + <kbd>N</kbd> | Create new note |
+| <kbd>⌘</kbd> + <kbd>T</kbd> | Open new tab |
+| <kbd>⌘</kbd> + <kbd>W</kbd> | Close current tab |
+
+## Quick Access
+
+| Shortcut | Action |
+|----------|--------|
+| <kbd>⌘</kbd> + <kbd>⇧</kbd> + <kbd>C</kbd> | Open calendar |
+| <kbd>⌘</kbd> + <kbd>⇧</kbd> + <kbd>N</kbd> | Open contacts |
+| <kbd>⌘</kbd> + <kbd>⇧</kbd> + <kbd>D</kbd> | Open daily notes |
+| <kbd>⌘</kbd> + <kbd>⇧</kbd> + <kbd>F</kbd> | Open advanced search |
+
+## Application
+
+| Shortcut | Action |
+|----------|--------|
+| <kbd>⌘</kbd> + <kbd>Q</kbd> | Quit Hyprnote |