Bug: InvalidCharacterError in getUrl when using non-Latin1 characters (e.g., Chinese)

[gl15121004754-hue]

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## Bug Report: `InvalidCharacterError` when using Unicode characters (e.g., Chinese)

### Description
The plugin fails to load when the configuration (Server URL, Vault path, or other settings) contains non-Latin1 characters (such as Chinese characters). This is caused by a direct call to the `btoa()` function, which does not support Unicode strings.

### Error Logs
```text
Plugin failure: opencode-obsidian InvalidCharacterError: Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the Latin1 range.
    at ProcessManager.getUrl (plugin:opencode-obsidian:486:25)
    at OpenCodePlugin.getServerUrl (plugin:opencode-obsidian:1079:32)
    at OpenCodePlugin.onload (plugin:opencode-obsidian:943:73)

Steps to Reproduce

1. Set a "Server URL" or have a Vault path that contains Chinese characters (e.g., C:/用户/Notes).
2. Enable the plugin.
3. The plugin fails to load and throws the error in the console.

Root Cause Analysis

The error occurs in ProcessManager.getUrl at line 486. The code likely uses window.btoa() to encode a string into Base64. However, btoa() only supports characters in the U+0000 to U+00FF range. Any character outside this (like UTF-8 characters) will trigger this exception.

Suggested Fix

To support Unicode strings, you can use the following pattern to encode the string properly before passing it to btoa:

// Replace direct btoa() calls with a Unicode-safe version
const safeBtoa = (str: string) => {
    return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g, (match, p1) => {
        return String.fromCharCode(parseInt(p1, 16));
    }));
};

Alternatively, since Obsidian runs in an environment with Node.js support, you can use Buffer:

const encoded = Buffer.from(inputString).toString('base64');

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Environment:

• Obsidian Version: [1.11.7]
• Plugin Version: [0.1.0]

[jensenojs]

same here

[SleeperXZY]

Same issue here. The Buffer solution works perfectly, and it would be great to see this merged!

[mtymek]

Fixed using Buffer, thanks!