fix(desktop): use filesystem-friendly userData directory name

[binbandit]

Summary

• Override Electron's userData directory path to use a clean, lowercase name (t3code) instead of the productName-derived T3 Code (Alpha).
• Existing users with the legacy directory are automatically detected and continue using it — no data loss.

Closes #578

Problem

Electron derives the userData path from productName in package.json. With "T3 Code (Alpha)" this produces:

Platform	Path
Linux	~/.config/T3 Code (Alpha)/
macOS	~/Library/Application Support/T3 Code (Alpha)/
Windows	%APPDATA%/T3 Code (Alpha)/

Spaces and parentheses in directory names are hostile to shell usage and violate Linux XDG naming conventions.

Solution

Call app.setPath("userData", ...) synchronously at the top level (before Electron's ready event) to override the path with a clean name. This is the same pattern VS Code uses — productName stays as-is for display purposes (window titles, About panel) while the data directory gets an explicit filesystem-friendly path.

New users get ~/.config/t3code/ (or platform equivalent).

Existing users are detected via fs.existsSync on the legacy path. If the old directory exists, it is used as-is so Chromium profile data (localStorage, cookies, sessions, cache) is preserved.

The userData directory is purely for Electron/Chromium internals — T3 Code's own state directory (~/.t3/userdata) is unaffected.

Changes

• apps/desktop/src/main.ts: Add resolveUserDataPath() function + app.setPath("userData", ...) call (+35 lines)

Note

Set Electron desktop app userData path to a filesystem-friendly directory at startup to preserve legacy data when present

Add resolveUserDataPath to compute platform-specific app data paths and call app.setPath("userData", resolveUserDataPath()) in main.ts to prefer a legacy Electron productName directory if it exists, otherwise use a sanitized lowercase directory.

📍Where to Start

Start with the resolveUserDataPath function and its invocation before app.whenReady() in main.ts.

^{Macroscope summarized 81a5efe.}

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[chuks-qua]

i was about to make a pr for this, thanks