feat(StudyBrowser): add customization options for header visibility, action icons, and primary study filtering

[SmartCodeJunctionInfinity]

Context

SmartCarePlus and other embedded OHIF deployments need tighter UI control over the Study Browser sidebar:

• Some workflows require hiding the header/filter bar entirely (kiosk, radiologist-only layouts, or embedded viewers).
• Some apps need to override or remove default action icons.
• In restricted studyMode setups, showing multiple study tabs creates confusion and mis-clicks.

This PR adds lightweight configuration hooks to support these use cases without affecting default behavior.

---

Changes & Results

✅ New customizations

1. studyBrowser.hideHeader

   • Boolean flag to toggle the visibility of the Study Browser header + filter bar.

2. studyBrowser.actionIcons

   • Allows overriding the default header action icons.
   • Can also be set to an empty array to hide all buttons.

3. Primary-only tab filtering

   • When studyMode === "primary", the Study Browser automatically filters tabs to show only the primary study.

Behavior

Before

• Header and actions were always visible.
• Tabs always showed all studies.

After

• Header visibility is configurable.
• Header buttons are customizable or removable.
• Tab list adapts automatically in restricted study modes.

All changes are backward-compatible. If no customization is provided, the current behavior remains unchanged.

---

Testing

1. Run OHIF locally.
2. Add any of the following to your customization config:

{
  studyBrowser: {
    hideHeader: true,
    actionIcons: [], // or custom icons
  }
}

3. Load a multi-study case.

4. Verify:

   • Header hides when enabled.
   • Action buttons change or disappear.
   • With studyMode = "primary", only the primary tab is shown.

---

Checklist

PR

• My Pull Request title is descriptive, accurate and follows the semantic-release format and guidelines.

Code

• My code has been well-documented (inline comments where behavior changes).

Public Documentation Updates

• The documentation page has been updated as necessary for any public API additions or removals.
  (Can be added if maintainers want this exposed in official customization docs.)

Tested Environment

• OS: Windows 10 Version 22H2
• Node version: 20.20.0
• Browser: Chrome (144.0.7559.61)

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