docs: update features list and readme for v0.5.2

[VariableThe]

Updating the readme and the features.md based on the new features that were added

Summary by CodeRabbit

• Documentation
  • Updated the feature overview to better explain slash-command autosuggestions and keyboard completion.
  • Expanded tag and folder guidance to include right-click actions for exporting or deleting tagged notes.
  • Added clearer notes about update behavior, including a “New Features” summary shown after updates.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 511197fb-a79f-4d82-bd92-1b360319db3f

📥 Commits

Reviewing files that changed from the base of the PR and between 10dfe45 and 61d3d69.

📒 Files selected for processing (2)

• README.md
• features.md

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📝 Walkthrough

Walkthrough

README.md and features.md are updated to document three features: a slash command autosuggest system (type /, use Tab to complete), an expanded tagging description with right-click tag pill context menu for bulk-delete/export, and a smart version update behavior that opens a "New Features" note after updates.

Changes

Documentation Updates

Layer / File(s)	Summary
Feature descriptions: slash commands, tags, version updates README.md, features.md	README feature bullets revised to describe slash command autosuggestion with Tab completion and tag pill right-click actions. features.md adds the "Slash Command Autosuggest" entry, replaces the prior "Tagging System" bullet with an expanded tag context menu description, and adds a "Smart Version Updates" entry.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐇 A / typed and ghostly text appears,
Right-click a tag and your export nears,
Updates bring notes fresh and new,
The docs now match what the app can do.
Hippity-hop, the README's complete! 🌿

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/v0.5.2-features

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