Add back banner

[laurakwhit]

Description & motivation 💭

Adds back <Banner /> in layout with text set via TEMPORAL_BANNER_TEXT.

Screenshots (if applicable) 📸

Design Considerations 🎨

Testing 🧪

How was this tested 👻

• Manual testing
• E2E tests added
• Unit tests added

Steps for others to test: 🚶🏽‍♂️🚶🏽‍♀️

Checklists

Draft Checklist

Merge Checklist

Issue(s) closed

#3150

Docs

Any docs updates needed?

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Project	Deployment	Actions	Updated (UTC)
holocene	Ready	Preview, Comment	Feb 11, 2026 11:08pm

[laurakwhit]

@Alex-Tideman was this intentionally removed? If so, I'll close this PR and update the docs.

[temporal-cicd]

• ⚠️ Type 'null' is not assignable to type '"activity" | "add-square" | "add" | "apple" | "archives" | "arrow-down" | "arrow-left" | "arrow-up" | "arrow-right" | "ascending" | "astronaut" | "batch-operation" | "book" | ... 129 more ... | "xmark-square"'.

[temporal-cicd]

Warnings

⚠️

📊 Strict Mode: 2 errors in 2 files (0.2% of 1126 total) src/lib/holocene/banner/banner.svelte (1) L60:4: Type 'null' is not assignable to type '"activity" | "add-square" | "add" | "apple" | "archives" | "arrow-down" | "arrow-left" | "arrow-up" | "arrow-right" | "ascending" | "astronaut" | "batch-operation" | "book" | ... 129 more ... | "xmark-square"'. src/routes/(app)/+layout.svelte (1) L60:23: Argument of type '(namespace: string) => { namespace: string; onClick: (namespace: string) => void; }' is not assignable to parameter of type '(value: string | null | undefined, index: number, array: (string | null | undefined)[]) => { namespace: string; onClick: (namespace: string) => void; }'.

Generated by 🚫 dangerJS against 4c00658