Add Toggle HUDs toolbar command

[gwigz]

Expose an optional "Toggle HUDs" button in the toolbar/toybox which can be added. This shows/hides HUD attachments, wrapping the existing View.ShowHUDAttachments/View.CheckHUDAttachments handlers.

The 18x18 toggle_hud.png icon is adapted from Phosphor Icons duo-tone cards-three glyph.

Handy when you don't want to learn or reach for the awkward hotkey.

[coderabbitai]

📝 Walkthrough

Walkthrough

A new toggle_hud toolbar command is introduced, wiring View.ShowHUDAttachments as the execute function and a new LLViewEnableHUDAttachments handler that disables the command when RLVa HUD locking is active. Matching icon texture entries and localization strings are added across three skins.

Changes

Toggle HUD Toolbar Command

Layer / File(s)	Summary
Command definition and enable handler indra/newview/app_settings/commands.xml, indra/newview/llviewermenu.cpp	toggle_hud command entry binds View.ShowHUDAttachments / View.CheckHUDAttachments / View.EnableHUDAttachments. LLViewEnableHUDAttachments::handleEvent returns false when RLVa's showhud behaviour is locked and LLPipeline::sShowHUDAttachments is true; registered in initialize_menus().
Icon textures and localization strings indra/newview/skins/default/textures/textures.xml, indra/newview/skins/alchemy/textures/textures.xml, indra/newview/skins/gemini/textures/textures.xml, indra/newview/skins/default/xui/en/strings.xml	Adds Command_ToggleHUD_Icon texture entry pointing to toolbar_icons/toggle_hud.png (preload enabled) in all three skins; adds label string "Toggle HUDs" and tooltip string "Show or hide HUD attachments".

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

🐇 Hip hop, a button appears in the bar,
To hide all the HUDs near and far!
RLVa says "no" when the locks are in play,
But otherwise toggle to your heart's delight today.
The rabbit has wired it — icons and strings,
Three skins get the icon on freshly-preloaded wings! 🎉

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Description check	⚠️ Warning	The PR description is missing the required Related Issues section and most of the pre-submission checklist items.	Add a Related Issues section with a link to the relevant GitHub issue, and complete the checklist items (testing, style guidelines, documentation, dependent changes, contributing guidelines review).

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Add Toggle HUDs toolbar command' clearly and concisely describes the main change: introducing a new optional toolbar button for toggling HUD visibility.
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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