feat: bump @tginternal/editor to 1.18.0 - html entity placeholder highlighting

[bdshadow]

This pr must go after: tolgee/editor#9 is merged and version of the editor updated.

Adds light/dark colors for the new "entity" placeholder (decoded HTML entities) rendered by @tginternal/editor, matching the tag colors but slightly lighter.

A user was complaining that translations were not readable. Now it's like this:

Summary by CodeRabbit

• New Features

  • Added a new placeholder style for entities in both light and dark themes, keeping placeholder styling more consistent across the app.

• Chores

  • Updated the editor dependency to the latest minor version for improved compatibility and maintenance.

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds an entity placeholder to the Placeholders type and supplies border, background, and text color values for both light and dark themes. The @tginternal/editor dependency is bumped from 1.17.0 to 1.18.0.

Entity Placeholder Colors

Layer / File(s)	Summary
Entity placeholder type and theme values webapp/src/colors.tsx, webapp/package.json	Placeholders type gains entity: Placeholder; light and dark colors objects add matching entity styling; editor package bumped to 1.18.0.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

A new entity hops into the palette today,
With border and background and text on display,
Light theme and dark theme both dressed in new hue,
The editor bumped up — version fresh and brand new,
🐇✨ This rabbit approves of the colorful stew!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly reflects the main changes: bumping @tginternal/editor and adding HTML entity placeholder highlighting.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bdshadow/html-entity-highlighting

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[dkrizan]

@bdshadow PR name should probably include @tginternal/editor bump