feat: add Treesitter support and fixed-size UI

Implement comprehensive Treesitter integration for more accurate context detection when generating mark names, with fallback to regex patterns.
Redesign the UI with a fixed 80x20 window size, featuring dimmed help text at the bottom and visual separators between sections.

Author: alexekdahl

README.md

@@ -18,12 +18,12 @@ Vim's built-in marks are great, but they're global and get messy fast. Marksman
 
 - **Project-scoped marks** - Each project gets its own isolated set of bookmarks
 - **Persistent storage** - Your marks survive Neovim restarts with automatic backup
-- **Smart naming** - Context-aware auto-generation based on code structure
+- **Smart naming** - Context-aware auto-generation using Treesitter and pattern matching
 - **Quick access** - Jump to marks with single keys or interactive UI
 - **Enhanced search** - Find marks by name, file path, or content with real-time filtering
 - **Mark reordering** - Move marks up/down to organize them as needed
 - **Multiple integrations** - Works with Telescope, Snacks.nvim, and more
-- **Memory efficient** - Lazy loading, cleanup, and debounced operations
+- **Memory efficient** - Lazy loading, marks caching, cleanup, and debounced operations
 - **Robust error handling** - Graceful fallbacks and comprehensive validation
 
 ## Requirements
@@ -135,6 +135,9 @@ require("marksman").setup({
     ProjectMarksFile = { fg = "#56B6C2" },
     ProjectMarksLine = { fg = "#D19A66" },
     ProjectMarksText = { fg = "#5C6370", italic = true },
+    ProjectMarksHelp = { fg = "#5C6370" },
+    ProjectMarksBorder = { fg = "#5A5F8C" },
+    ProjectMarksSeparator = { fg = "#3E4451" },
   },
 })
 ```
@@ -253,15 +256,19 @@ marksman.show_marks("optional_search")
 
 ## How it works
 
-**Storage**: Marks are stored in `~/.local/share/nvim/marksman_[hash].json` per project with automatic backup.
+**Storage**: Marks are stored in `~/.local/share/nvim/marksman_[hash].json` per project with automatic backup and caching for improved performance.
 
-**Smart Naming**: Auto-generates context-aware names:
+**Smart Naming**: Auto-generates context-aware names using Treesitter when available, falling back to pattern matching:
 - `fn:calculate_total` for functions
 - `class:UserModel` for classes  
 - `var:api_key` for variables
+- `method:process_data` for methods
+- `interface:Serializable` for interfaces
+- `trait:Iterator` for Rust traits
+- `type:Config` for type definitions
 - `filename:line` as fallback
 
-**Project Detection**: Uses Git root, common project files (.git, package.json, etc.), or current directory.
+**Project Detection**: Uses Git root, common project files (.git, package.json, etc.), or current directory with 30-second caching.
 
 **Search**: Multi-field search across mark names, file paths, and code content.