Add polished UX: tabs, kinetic scroll, animations, search, typography

- Tabbed interface with duplicate detection, overflow scroll arrows,
  mouse wheel support, and animated enter/exit transitions
- Kinetic scrolling on right-mouse drag with iOS-style rubber band
  overscroll and damped spring snapback (content area and sidebar)
- Framer Motion animations on sidebar, context menu, drop zone,
  focus mode, tabs, and all modals
- Full-text search with real-time DOM highlighting and match navigation
- Custom OverlayScrollbars replacing native scrollbars
- Tauri native drag-and-drop replacing broken browser drag events
- UI scale control (View menu spinner) persisted to localStorage
- Content zoom (Ctrl+Scroll) and width adjustment (Shift+Scroll)
- Right-click context menu with copy, zoom-adjusted positioning,
  and boundary clamping
- Text selection preserved on right-click via visual overlay
- Focus mode hides title/menu bars with animated transitions
- Premium editorial typography: progressive heading color cascade,
  gradient-fade horizontal rules, accent-colored list markers,
  subtle persistent link underlines, refined blockquotes and code blocks
- Sidebar table of contents with "No headings" empty state
- Markdown breaks and typographer enabled
- New app icons and updated README with full feature documentation

src-tauri/Cargo.lock

@@ -596,20 +596,6 @@ dependencies = [
  "syn 2.0.115",
 ]
 
-[[package]]
-name = "darkmark"
-version = "0.1.0"
-dependencies = [
- "serde",
- "serde_json",
- "tauri",
- "tauri-build",
- "tauri-plugin-dialog",
- "tauri-plugin-fs",
- "tauri-plugin-opener",
- "tauri-plugin-window-state",
-]
-
 [[package]]
 name = "darling"
 version = "0.21.3"
@@ -4308,6 +4294,20 @@ version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
 
+[[package]]
+name = "vesper"
+version = "0.1.0"
+dependencies = [
+ "serde",
+ "serde_json",
+ "tauri",
+ "tauri-build",
+ "tauri-plugin-dialog",
+ "tauri-plugin-fs",
+ "tauri-plugin-opener",
+ "tauri-plugin-window-state",
+]
+
 [[package]]
 name = "vswhom"
 version = "0.1.0"