docs: update installation instructions and add manual installation section

chore: bump version to 0.2.6 in Cargo.lock
refactor: fix formatting in theme-loader.js

Author: murdercode

README.md

@@ -47,16 +47,20 @@ A modern, cross-platform Pomodoro timer application built with Tauri (Rust + HTM
 The easiest way to install Presto on macOS is through Homebrew:
 
 ```bash
-# Add the Presto tap
-brew tap murdercode/presto
-
-# Install Presto
-brew install --cask presto
+brew install --cask murdercode/presto/presto
 ```
 
-#### Troubleshooting: "Presto is damaged and can't be opened"
+### Manual Installation
+
+Alternatively, you can download the latest DMG file directly from the [GitHub Releases page](https://github.com/murdercode/presto/releases). Simply:
+
+1. Download the `.dmg` file for the latest version
+2. Open the DMG file and drag Presto to your Applications folder
+3. Launch Presto from Applications or Spotlight
+
+#### ⚠️ Troubleshooting: "Presto is damaged and can't be opened"
 
-If you see this error when launching Presto for the first time, it's due to macOS Gatekeeper. Run this command to fix it:
+If you see this error when launching Presto for the first time, it's a temporary issue that occurs because the app lacks an Apple Developer signature (which requires paying $99 to Apple). This is a common situation for open-source applications. To resolve it, run this command in Terminal:
 
 ```bash
 xattr -d com.apple.quarantine /Applications/Presto.app

src-tauri/Cargo.lock

@@ -39,7 +39,7 @@ class ThemeLoader {
         // that gets updated by the build process or manually maintained
 
         // This could be enhanced to use a build-time script that generates this list
-                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                const knownThemes = [
+                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        const knownThemes = [
             'espresso.css',
             'matrix.css',
             'pommodore64.css'