feat(tangle-dapp): Implement pool creation flow & onboarding modals

[yurixander]

Summary of changes

Provide a detailed description of proposed changes.

• ➕ Created pool creation modal, which invokes the lst::create pool creation extrinsic on the active chain.
• ➕ Added input validation for addresses and also initial bond amount inputs.
• ➕ Added bridge page onboarding, which completes [FEAT] Add onboarding modals for restaking & bridge pages #2577.
• ➕ Created PercentageInput component for future use in [FEAT] Implement pool management modals #2589 (e.g. adjusting commission rate).

Proposed area of change

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• apps/tangle-dapp
• libs/webb-ui-components

Associated issue(s)

Specify any issues that can be closed from these changes (e.g. Closes #233).

• Closes [FEAT] Liquid staking pool creation flow #2569
• Closes [FEAT] Add onboarding modals for restaking & bridge pages #2577

Screen Recording

If possible provide screenshots and/or a screen recording of proposed change.

create-pool-flow.mp4

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Optional Checklist

• I have tested the changes locally.
• I have added brief documentation/comments to more complex code blocks or logic that isn't immediately clear.
• If new components were added, I've also added and verified their different possible states & edge cases (e.g. loading, error, empty).
• For UI changes, I've tested the changes on different screen sizes (responsive design).
• For UI changes, I've checked both light and dark mode.
• I've checked the console for any errors that might have been accidentally introduced by my changes.
• If important TODOs were left, I've created corresponding issues for them.
• If new flows or features were introduced, I've updated, added, or intend to add corresponding documentation including screenshots and/or screen recordings for them on the Webb Docs repository.

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