refactor: restructure interval selector hooks for improved modularity and maintainability

[kylengn]

Note

Modernizes the interval selector and its integrations with a modular architecture and streamlined API.

• Introduces new hook structure: use-interval-selector, use-interval-selector-input, use-interval-selector-navigation, and use-interval-selector-state; removes legacy monolithic logic and interval-selector.utils
• Replaces value-based API with selection/suggestions model: IntervalSelector now accepts relativeSuggestions and intervalSuggestions (with defaults) and no longer uses value/onValueChange or option/value strings
• Adds types.ts and utils (constants, format) for clearer types and formatting; generateDurationShortcut now returns the highest present unit; parseTextInterval no longer treats duration shortcuts as intervals
• Updates IntervalSelectorCalendar and IntervalSelectorSuggestions to operate on IntervalSelection directly; keyboard navigation refactored to work with unified suggestions list
• Cleans up dashboard context and toolbar by removing intervalValue state/props and wiring directly to selection
• Testing: adds unit tests for hooks and formatting, refines date formatting tests, introduces test/setup.ts, and splits Vitest config into storybook and unit projects

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Build	Status	Details	Updated (UTC)
default (Inspect)	👍 Changes approved	12 changed, 3 added	Jan 21, 2026, 7:01 AM

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[noe-charmet]

Offering a refactor on the current proposal.

I mainly focused on improving state management and removing all unnecessary bloat.

• Now all the state thinks with either Duration or Interval object natively.
• All the date / shortcut parsing and humanizing is done through existing items in this library.
• Removed as much as possible of the cheap operations outside of the state and straight in the render to make things more easy to comprehend, straight forward, and avoid updates on multiple render cycles.
• Reworked the Calendar selection to properly start with an empty state on open.

I didn't touche the animation / navigation / mouse handling parts as they are less critical to the behavior of the component. Not sure however how much we need all the ref passing around and editing.

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