Fixed issue in EditorStartup.init() where $qq will not work if the editor is in a Web Component

[mscherotter]

PR description

in EditorStartup init(),
this.$svgEditor = $qq('.svg_editor')
will return undefined if the editor is in a web component, Changing the line to
this.$svgEditor = this.$container.querySelector('.svg_editor')
will make the code work whether it is in a web component or not.

Checklist

Note that we require UI tests to ensure that the added feature will not be
nixed by some future fix and that there is at least some test-as-documentation
to indicate how the fix or enhancement is expected to behave.

• - Added Cypress UI tests
• - Ran npm test, ensuring linting passes and that Cypress UI tests keep
  coverage to at least the same percent (reflected in the coverage badge
  that should be updated after the tests run)
• - Added any user documentation. Though not required, this can be a big
  help both for future users and for the PR reviewer.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request addresses an issue where the $qq selector in EditorStartup.init() fails when the editor is within a Web Component. It replaces the selector with this.$container.querySelector('.svg_editor') to ensure compatibility. Additionally, it enhances accessibility by adding alt attributes to img elements and modifies the shadow DOM mode of the SESpinInput component to closed.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Modified the shadow DOM mode of the SESpinInput component to closed.	Changed mode from open to closed in this.attachShadow().	src/editor/components/seSpinInput.js
Added alt attributes to img elements for accessibility.	Added alt='No color' to the img element in SEPalette component. Added alt='Zoom dropdown' to the img element in seZoom component. Added alt='logo' to the img element in SeMenu component.	src/editor/components/sePalette.js src/editor/components/seZoom.js src/editor/components/seMenu.js
Modified the way the $svgEditor element is selected in the EditorStartup class to ensure compatibility with Web Components.	Replaced $qq('.svg_editor') with this.$container.querySelector('.svg_editor').	src/editor/EditorStartup.js

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[sourcery-ai]

Hey @mscherotter - I've reviewed your changes - here's some feedback:

Overall Comments:

• Good job adding alt attributes to the img elements.
• Consider using const instead of let for variables that are not reassigned after initialization.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[jfhenon]

need to check linter issue