feat: add experimental switch to remove sidebar help

[arikorn]

The help buttons are now available on the heading-bar help menu, so this PR gives the option to free up space on the sidebar. (It makes a pretty big difference, especially with Settings open, which almost always ends up requiring the scrollbar when the help buttons are there.)

Also add a little context-help to the other experimental options -- please feel free to edit the text if you like the idea but not the wording.

Summary by CodeRabbit

• New Features

  • Added configurable option to hide sidebar help buttons (What's New, User Guide, Support).

• Improvements

  • Sidebar and Cloud settings now persist per browser.
  • Companion Cloud section updated with deprecation information.
  • Removed automatic page reload when toggling Cloud settings.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This PR refactors the webui's Sidebar and ExperimentsConfig components to use localStorage-backed React state hooks instead of direct localStorage reads. It introduces configurable toggles for hiding sidebar help buttons and managing the companion cloud feature, making the UI state more reactive and persistent.

Changes

Cohort / File(s)	Summary
Sidebar State Management webui/src/Layout/Sidebar.tsx	Replaced direct localStorage checks with state-driven rendering using hideHelpButtons and showCloud hooks. Conditionally renders help navigation group (What's New, User Guide, Support) based on showHelpButtons state.
Experiments Configuration webui/src/UserConfig/Sections/ExperimentsConfig.tsx	Introduced localStorage-backed state hooks for hideSidebarHelp and showCloud. Updated toggle controls to manage sidebar help visibility and cloud feature deprecation status with enhanced inline help text and persistent browser-local storage behavior.

Poem

🎛️ State and storage dance as one,
localStorage hooks, cleanly done!
Help buttons hide, configs persist,
Your preferences won't be missed. ✨

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 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 feature: adding an experimental switch to hide sidebar help buttons, which aligns directly with the PR's primary objective and changes.

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[arikorn]

Oh, yeah, Rabbit reminded me: I used useLocalStorage to avoid needing a refresh (will want it that way in the future anyway) and while I was doing sidebar stuff, I did the same for Companion Cloud. I could have done it for touch backend too, but didn't see a need.

(Also, I added an image to the OP, above).