fix(engine): use proper paths for settings

[jog1t]

Description

This change renames the engine route from /connect to /settings and enhances the sidebar navigation with improved visual design. The main changes include:

• Renamed connect.tsx to settings.tsx and updated the route path from /ns/$namespace/connect to /ns/$namespace/settings
• Added start icons to sidebar header buttons (gift icon for changelog, message icon for feedback, book icon for docs, Discord and GitHub icons for community links)
• Renamed Subnav component to EngineSubnav and restructured its layout to include a Settings link and improved spacing
• Changed the "Instances" label to "Actors" in the navigation
• Updated button variants in the actors list empty state from outline/secondary to ghost
• Simplified the provider dropdown in settings by removing the submenu structure for non-cloud app types

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[jog1t]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• fix(frontend): remove flashing upgrade notice #4451
• fix(frotnend): fix icons kiling the bundle #4450
• feat(frontend): ping actor if its in the crash loop #4448
• fix(engine): use proper paths for settings #4447 👈 (View in Graphite)
• feat(frontend): add outdated indicator to runners #4446
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[railway-app]

🚅 Deployed to the rivet-pr-4447 environment in rivet-frontend

Service	Status	Web	Updated (UTC)
frontend-cloud	😴 Sleeping (View Logs)	Web	Mar 19, 2026 at 1:52 pm
frontend-inspector	😴 Sleeping (View Logs)	Web	Mar 19, 2026 at 12:25 pm
website	❌ Build Failed (View Logs)	Web	Mar 17, 2026 at 9:17 pm
ladle	❌ Build Failed (View Logs)	Web	Mar 17, 2026 at 9:17 pm
mcp-hub	✅ Success (View Logs)	Web	Mar 17, 2026 at 9:16 pm

[claude]

PR Review

Summary

This PR fixes frontend routing by renaming the engine settings route from /connect to /settings, which better reflects the page purpose. It also includes related UI polish.

What's Good

• The route rename from connect to settings is a meaningful correction. The old path /ns/$namespace/connect was misleading for a settings page.
• routeTree.gen.ts changes are expected auto-generated output from the route rename.
• EngineSubnav is a clearer name than Subnav.
• The 'Go to Settings' link fix in actors-list.tsx correctly targets /settings now.

Issues / Feedback

1. PR description is empty
The PR template checkboxes are all unchecked and no description was provided. Please fill in what changed and why, especially since there are both a bug fix and UI changes bundled together.

2. Scope relative to PR title
The commit title is fix(engine): use proper paths for settings but the diff also includes icon additions to sidebar header buttons (faBook, faDiscord, faGithub), button variant changes (outline/secondary to ghost), gap and border tweaks in EngineSubnav, and engine-specific ProviderDropdown behavior in settings.tsx. These are reasonable changes but should be called out in the description so reviewers understand the intent.

3. Engine-mode ProviderDropdown behavior worth confirming
In settings.tsx, engine mode now renders external cloud items flat (no submenu, no Rivet Cloud option) while cloud mode wraps them in a submenu. This UX difference seems intentional but is not documented anywhere. A short note in the PR description confirming this is the desired behavior would help reviewers.

4. Draft status and downstack dependency
This is still a draft and depends on PR #4446. No action needed until that is resolved.

---

No security or performance concerns. Overall this is a straightforward fix — main ask is to fill out the PR description and confirm the ProviderDropdown engine-mode behavior is intentional.

[pkg-pr-new]

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commit: 4170ed2