fix(frontend): dashboard audit polish — inspector defaults, empty states, OSS theme toggle

[NicholasKissel]

Description

Follow-ups from a design/flow audit of the OSS dashboard and actor Inspector. Small, self-contained polish; no API or schema changes. Product-constant and brand SVG changes were deliberately left out to avoid conflicting with #5633 and #5672.

Inspector

• State is the default tab (Workflow for workflow actors). Every actor has a SQLite DB, so Database always won before. The dashboard now canonicalizes the tab order advertised by the runner's inspector bundle (orderInspectorTabs), so older runners get the same order without a rebuild; custom tabs keep their advertised order after the built-ins.
• Database tab: user tables first, _rivet_* tables grouped under an "Internal" label, first user table selected by default.
• Connections tab: table (ID, type, hibernatable, params, state) with a proper empty state instead of a raw object tree.
• Queue tab: empty state matches Schedules (icon + heading + hint).
• Metadata: Key rendered as copyable mono text instead of a JSON tree; "Connectable since" / "Sleeping since" labels.

Dashboard shell

• OSS top bar gets a light/dark toggle (cloud keeps it in the user dropdown).
• ?n=counter (plain string instead of the serialized array) renders instead of a Zod error page. Normalized in validateSearch because the search schema is an intersection with z.record, which rejects a per-field transform.
• Provider/runner copy no longer references "Rivet Cloud" in OSS; no-providers alert uses a plug icon and "Add Provider"; settings drawer description is flavor-aware; empty-row text is consistent between the Providers and Runners tables.
• Live badge dot uses primary instead of destructive.
• "No more Actors to load." only shows once more than one page has been loaded.

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?

• tsc --noEmit in frontend/: same 42 pre-existing error lines before and after (none in touched files).
• biome check on all touched files: formatting clean; remaining lint findings are on untouched lines.
• Visual verification against a local engine (rivetkit 2.3.15) with seeded actors, OSS flavor. Tab reorder verified on the real iframe path; the in-iframe tab components (Database/Queue/Connections) are compiled into the rivetkit NAPI bundle, so they were verified by temporarily forcing the dashboard's legacy inline path (not committed).
• Cloud flavor compiles; not rendered (no cloud login available).

Before / after

Default tab + list footer

Database tab

Connections tab (the 2 vs 1 count is from re-running the seed client between shots, not a UI difference)

Queue empty state

Metadata

Namespace settings (empty namespace) + theme toggle

?n=counter

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

[railway-app]

🚅 Deployed to the actors-pr-5678 environment in rivet-frontend

Service	Status	Web	Updated
kitchen-sink	😴 Sleeping (View Logs)	Web	Sep 8, 2026 at 9:10 pm UTC
frontend-cloud	😴 Sleeping (View Logs)	Web	Sep 8, 2026 at 9:07 pm UTC
frontend-inspector	😴 Sleeping (View Logs)	Web	Sep 8, 2026 at 9:07 pm UTC
ladle	✅ Success (View Logs)	Web	Sep 8, 2026 at 9:02 pm UTC
mcp-hub	✅ Success (View Logs)	Web	Sep 8, 2026 at 9:00 pm UTC
website	❌ Build Failed (View Logs)	Web	Sep 8, 2026 at 8:59 pm UTC