feat: redirect to previous page after editing entities

[DonKoko]

Implement smart UX improvement that redirects users back to the previous page after editing, with special handling for new tabs.

Behavior:

• Normal navigation: Redirect back to previous page (list, search, etc.)
• New tab (cmd+click/ctrl+click): Stay on edit page for continued work

Implementation:

• Add getRefererPath() helper to extract pathname from Referer header
• Add 8 comprehensive unit tests for getRefererPath()
• Create RefererRedirectInput component that:
  • Detects new tab opens via window.history.length
  • Clears redirect value when opened in new tab
  • Passes referer for normal navigation
• Update route actions to check redirectTo:
  • If present: redirect to previous page via safeRedirect
  • If empty: stay on current page (return json)
• Add redirectTo field to form schemas
• Update loaders to pass referer to components

Technical details:

• Server-side referer extraction follows Remix conventions
• Client-side new tab detection via window.history.length === 1
• Safe redirects prevent open redirect vulnerabilities
• DRY implementation with reusable component
• Preserves asset "Add another" button behavior

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
shelf-docs	Ignored	Preview		Oct 15, 2025 2:06pm

[Copilot]

Pull Request Overview

This PR enhances post-edit navigation by redirecting users back to their previous page after saving, while keeping users on the edit page when opened in a new tab.

• Add getRefererPath helper and unit tests
• Introduce RefererRedirectInput to inject safe redirect target and detect new-tab scenarios
• Integrate redirectTo through forms, loaders, and actions using safeRedirect

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
app/utils/http.server.ts	Adds getRefererPath to extract referrer path for redirect targets.
app/utils/http.server.test.ts	Adds comprehensive tests for getRefererPath behavior.
app/routes/layout+/locations.$locationId.edit.tsx	Wires referer through loader and form; adds safe redirect on action.
app/routes/layout+/kits.$kitId.edit.tsx	Wires referer through loader and form; adds safe redirect on action.
app/routes/layout+/assets.$assetId.edit.tsx	Wires referer through loader and form; adds safe redirect on action; handles addAnother.
app/components/location/form.tsx	Adds redirectTo schema field and RefererRedirectInput.
app/components/kits/form.tsx	Adds redirectTo schema field and RefererRedirectInput.
app/components/assets/form.tsx	Adds redirectTo schema field and RefererRedirectInput; removes unused Link import.
app/components/forms/referer-redirect-input.tsx	New component to pass referer and clear it for new-tab flows.