feat: feature flagging moved over to redesign

[corypride]

Ports the Feature Control (feature flagging) admin page from the original frontend to the redesign. System admins can now toggle platform-wide features on and off directly from the redesigned UI.

Changes include:

• New FeatureControl.tsx page under /feature-control, accessible only to SystemAdmin role

• Toggle support for top-level features (Knowledge Center, Program Hub & Tracking) and Knowledge Center sub-features (Request Content Button, Helpful Links, Videos)

• Confirmation dialog before applying any toggle, with a statewide impact warning when disabling resident-facing features

• Sub-features are visually disabled (opacity + Switch disabled) when their parent feature is off

• "Feature Control" nav link added to Sidebar.tsx admin nav, visible only to system admins, using AdjustmentsHorizontalIcon

• systemAdminRoutes route group added to app-routes.tsx gating the route to UserRole.SystemAdmin

• Related issues: https://app.asana.com/1/1201607307149189/project/1209460078641109/task/1214641676425184

Screenshot(s)

Additional context

The API calls (PUT auth/features/:key and PUT auth/page-features/:key) were already in place from the original frontend — this commit only brings the UI into the redesign. No backend changes were made.

RELATED INFO

https://app.asana.com/1/1201607307149189/project/1209460078641109/task/1214641676425184

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: d0f3c13f-ea2f-48cd-9785-2ba71118317a

📥 Commits

Reviewing files that changed from the base of the PR and between edf64e4 and 47754cc.

📒 Files selected for processing (3)

• frontend/src/components/navigation/Sidebar.tsx
• frontend/src/pages/admin/FeatureControl.tsx
• frontend/src/routes/app-routes.tsx

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📝 Walkthrough

Summary by CodeRabbit

• New Features
  • Added a new Feature Control page for system administrators to manage platform features
  • System administrators can enable/disable features (Knowledge Center, Program Hub & Tracking) with confirmation dialogs and clear feedback
  • Warning alerts display when changes affect resident-facing functionality
  • Knowledge Center includes dependent sub-features that can be individually toggled
  • Navigation menu updated with Feature Control link for system admins

Walkthrough

This PR adds a new system-admin-only feature control interface that allows toggling top-level features (Knowledge Center and Program Hub) and dependent sub-features. The change introduces a new admin page accessible via /feature-control, adds a conditional navigation link in the admin sidebar, and wires the route through the app's authenticated route composition.

Changes

System Admin Feature Control Page

Layer / File(s)	Summary
Route structure for feature control frontend/src/routes/app-routes.tsx	New systemAdminRoutes route group defines the feature-control path and is integrated into AdminRoutes.children alongside existing admin route groups.
Navigation link for system admins frontend/src/components/navigation/Sidebar.tsx	Admin sidebar conditionally renders a "Feature Control" link when isSysAdmin(user) is true, pointing to /feature-control with active state detection based on the current path.
Feature Control page implementation frontend/src/pages/admin/FeatureControl.tsx	Page component reads user feature access, renders two top-level feature toggles with dependent sub-features, manages pending toggle state, and sends API requests to auth/features/{key} or auth/page-features/{key} on confirmation. Dialog UI varies message and warnings based on enable/disable action and resident impact; sub-features are disabled when their parent feature is off.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

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.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'feat: feature flagging moved over to redesign' directly describes the main change: porting the Feature Control (feature flagging) admin page from the original frontend to the redesign.
Description check	✅ Passed	The description is comprehensive and directly related to the changeset, explaining what was ported, which new components were added, and implementation details like the confirmation dialog and role-based access control.
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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[CK-7vn]

Couple things, not big at all, nice work man.

[carddev81]

Amazing work @corypride !! Thanks for getting this done