docs: modernize README with badges and improved layout

Author: k1-c

README.md

@@ -1,8 +1,19 @@
+<div align="center">
+
 # linear-tui
 
-A TUI client for [Linear.app](https://linear.app) — manage issues, projects, and cycles from your terminal.
+**A TUI client for [Linear.app](https://linear.app) — manage issues, projects, and cycles from your terminal.**
+
+[![Crates.io](https://img.shields.io/crates/v/linear-tui.svg)](https://crates.io/crates/linear-tui)
+[![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
+[![CI](https://github.com/k1-c/linear-tui/actions/workflows/ci.yml/badge.svg)](https://github.com/k1-c/linear-tui/actions/workflows/ci.yml)
+[![Rust](https://img.shields.io/badge/rust-1.85%2B-orange.svg)](https://www.rust-lang.org)
+
+Built with [ratatui](https://ratatui.rs/) and the Linear GraphQL API.
 
-Built with Rust using [ratatui](https://ratatui.rs/) and the Linear GraphQL API.
+</div>
+
+---
 
 ## Features
 
@@ -22,6 +33,10 @@ Built with Rust using [ratatui](https://ratatui.rs/) and the Linear GraphQL API.
 cargo install linear-tui
 ```
 
+### From GitHub Releases
+
+Pre-built binaries are available for Linux, macOS (Intel/Apple Silicon), and Windows on the [Releases](https://github.com/k1-c/linear-tui/releases) page.
+
 ### From source
 
 ```sh
@@ -30,58 +45,54 @@ cd linear-tui
 cargo install --path .
 ```
 
-## Authentication
+## Getting Started
 
-### OAuth2 (recommended)
+### 1. Authenticate
+
+**OAuth2 (recommended)**
 
 ```sh
 linear-tui auth login
 ```
 
-This opens your browser for Linear OAuth authorization. Tokens are stored locally and refreshed automatically.
+Opens your browser for Linear OAuth authorization. Tokens are stored locally and refreshed automatically.
 
-### Personal API Key
+**Personal API Key**
 
 Generate a key at [Linear Settings > API](https://linear.app/settings/api), then:
 
 ```sh
 linear-tui auth token <your-api-key>
 ```
 
-### Logout
-
-```sh
-linear-tui auth logout
-```
-
-## Usage
+### 2. Launch
 
 ```sh
 linear-tui
 ```
 
-### Keybindings
-
-| Key         | Action                                               |
-| ----------- | ---------------------------------------------------- |
-| `j` / `k`   | Move cursor down / up                                |
-| `g` / `G`   | Jump to first / last item                            |
-| `Enter`     | Open detail view                                     |
-| `Esc` / `q` | Back / quit                                          |
-| `1`-`4`     | Switch tabs (Issues / My Issues / Projects / Cycles) |
-| `s`         | Change status                                        |
-| `p`         | Change priority                                      |
-| `a`         | Change assignee                                      |
-| `c`         | Add comment (Ctrl+Enter to send)                     |
-| `t`         | Switch team                                          |
-| `f` / `F`   | Filter / clear filters                               |
-| `/`         | Search issues                                        |
-| `r`         | Reload data                                          |
-| `?`         | Toggle help                                          |
+## Keybindings
+
+| Key | Action |
+| --- | --- |
+| `j` / `k` | Move cursor down / up |
+| `g` / `G` | Jump to first / last item |
+| `Enter` | Open detail view |
+| `Esc` / `q` | Back / quit |
+| `1`-`4` | Switch tabs (Issues / My Issues / Projects / Cycles) |
+| `s` | Change status |
+| `p` | Change priority |
+| `a` | Change assignee |
+| `c` | Add comment (`Ctrl+Enter` to send) |
+| `t` | Switch team |
+| `f` / `F` | Filter / clear filters |
+| `/` | Search issues |
+| `r` | Reload data |
+| `?` | Toggle help |
 
 ## Configuration
 
-Config file location: `~/.config/linear-tui/config.toml`
+Config file: `~/.config/linear-tui/config.toml`
 
 ```toml
 [auth]
@@ -90,19 +101,19 @@ Config file location: `~/.config/linear-tui/config.toml`
 # api_key = "lin_api_xxxxx"
 
 [ui]
-default_team = "Core"      # Auto-select this team on startup
-items_per_page = 50         # Issues per page (pagination)
-theme = "default"           # "default" | "light" | "ocean"
+default_team = "Core"       # Auto-select this team on startup
+items_per_page = 50          # Issues per page (pagination)
+theme = "default"            # "default" | "light" | "ocean"
 ```
 
 ### Themes
 
-| Theme     | Description                        |
-| --------- | ---------------------------------- |
-| `default` | Dark theme with cyan accents       |
-| `light`   | Light background with blue accents |
-| `ocean`   | Dark blue palette with soft colors |
+| Theme | Description |
+| --- | --- |
+| `default` | Dark theme with cyan accents |
+| `light` | Light background with blue accents |
+| `ocean` | Dark blue palette with soft colors |
 
 ## License
 
-MIT
+[MIT](LICENSE)