revert: bubble menu hidden behind sticky toolbar

[gajjug004]

Issue

• The sticky toolbar is rendering on top of the modal ("Create New Page")
• The dropdown ("Unpublish") from the top-right toolbar is also likely clipping/overlapping incorrectly.

PR - #540

Summary by CodeRabbit

• Style
  • Improved z-index layering and stacking context for the editor interface to ensure proper visual component layering.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

---

Walkthrough

The changes adjust CSS stacking contexts and z-index layering in the wiki editor components. The WikiEditor container now establishes a new CSS stacking context using isolation: isolate. Concurrently, explicit positioning and z-index rules are removed from the WikiBubbleMenu component. These modifications affect how the visual layering and stacking order of the editor and bubble menu elements are handled.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: reverting z-index/positioning issues with the bubble menu being hidden behind the sticky toolbar, which directly addresses the problems shown in the PR description images.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}