Add searchable timezone combobox

[felixgollnhuber]

Summary

• Replaced the timezone selects with a shared searchable combobox based on cmdk and Popover.
• Applied the new control to the create flow, public event view, and organizer manage view.
• Added search placeholder and empty-state copy to i18n and kept timezone sorting unchanged.

Testing

• Added unit tests covering timezone search filtering and selection in the create, public, and manage flows.
• pnpm verify passed, including the full test suite, Prisma generation, and production build.

[felixgollnhuber]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep them coming!

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[Copilot]

Pull request overview

Introduces a shared, searchable timezone combobox (built with cmdk + Popover) and replaces existing timezone selects across the create flow and event heatmap surfaces, with i18n copy and unit test updates.

Changes:

• Added a reusable TimezoneCombobox component and a cmdk-based Command UI wrapper.
• Replaced existing timezone Select usage in the create event form and event heatmap viewer timezone control.
• Added i18n strings for search placeholder/empty state and updated tests to cover filtering + selection.

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/lib/i18n/messages.ts	Adds i18n strings for timezone search placeholder + empty state (EN/DE).
src/components/ui/command.tsx	Adds cmdk-based command primitives used by the combobox.
src/components/timezone-combobox.tsx	Implements the shared searchable timezone combobox with filtering and “automatic timezone” support.
src/components/event-heatmap.tsx	Replaces viewer timezone Select with TimezoneCombobox.
src/components/create-event-form.tsx	Replaces event timezone Select with TimezoneCombobox, preserving invalid/description wiring.
src/components/create-event-form.test.tsx	Adds coverage for filtering timezone options and keeping the selected value.
src/components/public-event-client.test.tsx	Updates tests to exercise search filtering behavior in the public flow.
src/components/manage-event-client.test.tsx	Updates tests to exercise search filtering behavior in the organizer/manage flow.
package.json	Adds cmdk dependency.
pnpm-lock.yaml	Locks cmdk dependency resolution.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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