settings_um: make per-usermod sections collapsible

[lost-hope]

The usermod settings page grows one section per configured usermod and has no way to collapse the ones you're not editing, making it long to scroll on setups with many usermods. Turn each section into a native

/

element (default open, so nothing hides on first load) and add Expand all / Collapse all buttons above the list.

Summary by CodeRabbit

• New Features
  • Usermod configuration sections can now be expanded or collapsed individually.
  • Added controls to expand or collapse all usermod sections at once.
  • Added visual indicators showing each section’s open or closed state.

[coderabbitai]

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• wled00/data/settings_um.htm

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Walkthrough

Usermod configuration sections now render as expandable panels with custom arrow markers. New controls expand or collapse all usermod panels through setAllUM(open).

Changes

Usermod configuration panels

Layer / File(s)	Summary
Expandable panel structure wled00/data/settings_um.htm	Usermod sections now use initially open <details> panels with <summary> headings. Custom styles control markers, cursors, and arrow rotation.
Panel state controls wled00/data/settings_um.htm	setAllUM(open) updates every usermod panel. Buttons invoke it to expand or collapse all panels.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Feature

Suggested reviewers: dedehai

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: making per-usermod sections collapsible on the settings page.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

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[willmmiles]

I'd prefer the MM approach of giving each usermod its own settings page. (Implemented in #5742 - 2f7b323 - with backwards compatibility).

I'll split #5742 in to that change (which should be uncontrovercial, I hope) and a separate PR for embedded usermod UI integration discussion.

[lost-hope]

I like having it at one page, to cross reference between usermods. but that is a niche need
here a picture of my testing setup with a couple of usermods

and here collapsed: