fix(stakes): remove 1 ICP minimum for neuron top-up

[yhabib]

Motivation

The top-up neuron flow previously enforced a minimum of 1 ICP on the frontend, but there is no such limit at the protocol level. Any positive amount should be valid for topping up an existing neuron.

Changes

• Removed the 1 ICP minimum validation from the top-up flow; it now only requires an amount greater than zero.
• Updated the error message to align with the Send ICP flow: "Enter an amount greater than zero."
• Revised end-to-end tests to validate both zero amount and insufficient balance errors instead of the previous minimum check.

[github-actions]

📊 Build Bundle Stats

The latest build generated the following assets:

dist/index.html                                           1.92 kB │ gzip:   0.69 kB
dist/assets/index-Clheerh4.css                          129.10 kB │ gzip:  20.41 kB
dist/assets/neuron-VGIfgnqp.js                            0.08 kB │ gzip:   0.09 kB
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dist/assets/useIcpIndex-BYCr-FoI.js                       1.08 kB │ gzip:   0.63 kB
dist/assets/Switch-CJCknlk_.js                            1.65 kB │ gzip:   0.83 kB
dist/assets/useIcpSwapPrices-D7pCcQM9.js                  1.72 kB │ gzip:   0.94 kB
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dist/assets/vendor-icp-CEMV6PMV.js                      402.37 kB │ gzip: 100.05 kB
dist/assets/vendor-libs-BHnWrbZ3.js                     540.02 kB │ gzip: 178.56 kB

[Copilot]

Pull request overview

This PR updates the neuron top-up (increase stake) flow to remove the frontend’s 1 ICP minimum and instead only require a positive amount, aligning the validation/error message with the Send ICP flow.

Changes:

• Removed the 1 ICP minimum validation from the neuron top-up view and replaced it with a “greater than zero” check.
• Updated the English i18n error message for low amount to “Enter an amount greater than zero.”
• Adjusted the e2e test case for the top-up validation flow.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/governance-app-frontend/src/features/stakes/components/neuronDetail/NeuronDetailIncreaseStakeView.tsx	Replaces min-amount validation with <= 0 validation for top-ups.
src/governance-app-frontend/src/i18n/en/modals/neuronDetail.json	Updates the low-amount error message text for neuron top-up.
src/governance-app-frontend/tests/e2e/neuron-detail-modal.spec.ts	Updates e2e validation scenario inputs for the top-up flow.

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