Fix Windows installer temporary cleanup

[giri256]

Description

Prevents Windows installer temporary-file cleanup from failing an otherwise successful installation.

• Adds one best-effort cleanup helper that uses -LiteralPath for exact path handling.
• Skips missing or invalid paths safely.
• Converts cleanup failures into warnings instead of terminating the installer.
• Uses the helper for the Spicetify bootstrap archive and the Listening Stats archive/extraction directory.

Type of Change

• Bug fix
• New feature
• Enhancement / improvement
• Documentation
• Refactor (no functional change)
• Other

Related Issue

Fixes #55

How to Test

1. Parse install.ps1 with Windows PowerShell 5.1.
2. Invoke the cleanup helper with file and directory paths containing spaces and [] wildcard characters.
3. Verify both paths are removed and a missing path does not throw.
4. Run the repository checks listed below.

Verification

• Windows PowerShell 5.1 parser and focused cleanup regression: passed.
• corepack pnpm@9.15.9 lint: passed with three pre-existing CSS specificity warnings.
• corepack pnpm@9.15.9 typecheck: passed.
• TZ=UTC corepack pnpm@9.15.9 exec vitest run --reporter=dot: 79 test files and 1,222 tests passed.
• NODE_ENV=production corepack pnpm@9.15.9 build: passed.
• git diff --check: passed.

Checklist

• Tested locally with a production build (no errors)
• Tested by reinstalling into Spotify/Spicetify (not run because this cleanup-only patch would mutate the local application installation)
• Provider behavior is unaffected
• No sensitive data included