Prepare 4.1.0

[tahabasri]

Release 4.1.0 — bundles the issues that landed on main since 4.0.0.

4.1.0

• [#113] Added folder coloring with optional cascade to child folders.
• [#137]
  • Redesigned the snippet editor into a two-panel layout.
  • Fixed snippet edits randomly not saving.
• [#138] Fixed snippet IntelliSense missing in remote (SSH) sessions.
• [#136] Added setting to open folders collapsed by default.
• [#135] Surfaced language-less Snippets as Global in IntelliSense.
• [#134] Added support for importing snippets into a dedicated folder (without overwriting).

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Also in this release branch:

• Reworked the README: restructured all 8 feature sections, added a dedicated Settings section.
• Replaced the retired shields.io Marketplace badges with vsmarketplacebadges.dev, added logos/brand colors and an Open VSX badge.
• Renamed UI labels: "Cursor AI" -> "Cursor", "Windsurf" -> "Devin AI (aka Windsurf)".

Version touch-points bumped in lockstep: package.json, changelogVersion, and the CHANGELOG.md heading.