[DT-3501] ux updates to timezone popover

[andrewzamojc]

Description & motivation 💭

This PR improves the UX of the timezone popover. I attempts to consolidate the option for the user and give a better scrolling experience.

• previously the popover scrolled all content, now only the timezone menu items scroll
• relative is now "just another format"
• timezone does not lose/reset, even when switching to formats that don't use timezone (relative, iso)
• 12/24 hour option is disabled for relative and iso formats
• timezone menu items are disabled for relative and iso formats
• auto scroll to selected item when the popover opens

also

• minor improvemtn to workflows page heading, so refresh button doesn't push to the right

Screenshots (if applicable) 📸

BEFORE

AFTER

BEFORE

AFTER

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

Docs

Any docs updates needed?

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Project	Deployment	Review	Updated (UTC)
holocene	Ready	Preview, Comment	Jan 27, 2026 6:59pm

[temporal-cicd]

	Warnings
⚠️	📊 Strict Mode: 2 errors in 2 files (0.2% of 1120 total) src/lib/utilities/format-date.ts (1) L157:3: Function lacks ending return statement and return type does not include 'undefined'. src/lib/pages/workflows-with-new-search.svelte (1) L90:4: Type 'string | null' is not assignable to type 'string'.

Generated by 🚫 dangerJS against 3194ac5

[andrewzamojc]

Hey @bilal-karim . What do you think of these updates to the timezone popover?

[bilal-karim]

@andrewzamojc Looks much better. Is there a reason we're adding System, in addition 12h/24h for the hour format?

[andrewzamojc]

@bilal-karim The browser has a default 12/24 hour option, so choosing system mean staying in sync with your computer's setting. Sort of like how we have system for light/dark mode. Let me know if you'd like a change.

[bilal-karim]

@andrewzamojc I don't mind it. I'm just thinking if we should just use the label instead of the icon to be consistent with 12h and 24.