Tweak styles in multiple components

[kmcginnes]

Description

• Update icons in graph toolbar to use Lucide Icons
• Tweak Toast styles with rounder corners and more padding
• Add loading type to toast notifications with spinner
• Remove redundant spin animation since tailwindcss-animate includes one
• Add simple Spinner component
• Tweak IconButton style to show background when popover is open, reduce icon size in default size variant
• Tweak PanelHeaderActionButton to forward ref (allows popover to work) and allow the component to not have a click handler
• Tweak PanelHeaderActions to increase gap between items
• Tweak PanelHeaderDivider to ad a bit more space around the divider
• Tweak ImportantBlock to increase padding and rounder corners
• Fix alignment of "Node label" and "Attribute" fields in search sidebar
• Add react-hook-form, which we will slowly migrate to for any form that has a submit action (first use will be export, then connection creation or editing)
  • Add form components that integrate with react-hook-form and zod for validation

Validation

Before	After

Related Issues

• Part of Use Tailwind & Radix #700
• Part of [Project] Share a populated graph with another person #440

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.

[Cole-Greer]

All of those tweaked components look a lot better to me.