docs: add webtoolz Mermaid Studio to community integrations

[kaialder]

Adding Mermaid Studio by webtoolz to the community integrations list under Productivity tools.

What it is:

• Free, browser-based Mermaid editor
• Live preview as you type
• 4 curated themes (default, dark, forest, neutral)
• Unlimited PNG/SVG export
• Shareable links
• 100% client-side, no signup required

Placed alphabetically next to Mermaid Flow Visual Editor in the Productivity tools section.

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commit: 0d7367d

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 3.52%. Comparing base (277c496) to head (a602c08).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #7400   +/-   ##
=======================================
  Coverage     3.52%   3.52%           
=======================================
  Files          509     509           
  Lines        49790   49790           
  Branches       785     785           
=======================================
  Hits          1754    1754           
  Misses       48036   48036           

Flag	Coverage Δ
unit	3.52% <ø> (ø)

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Build	Status	Details	Updated (UTC)
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[lee-treehouse]

@kaialder looks to me like lint step is failing because of spell checking webtoolz :) I think you can add a cspell ignore, there are a few examples in the code already (actually, check out line 283 of this file, you can add to the ignore list there, that will affect the entire file as explained here)