Add Fuse governance migration prompt on Savings/Stake with explicit modal wizard

[Copilot]

Users with non-zero Fuse governance stake had no in-product migration cue on /savings or /stakes, making migration easy to miss. This PR adds a non-blocking popover entrypoint and an explicit-click modal wizard, then hides the prompt once Fuse governance stake reaches zero.

• Fuse governance stake detection

  • Added useFuseGovernanceStake hook to compute connected-wallet Fuse governance exposure from existing stake data (GOODDAO protocol filter).
  • Exposes stakeAmount, hasStake, and refetch for UI state and post-migration verification.

• Popover CTA entrypoint

  • Added shared FuseGovernanceMigrationPrompt component.
  • Shows inline prompt only when wallet is connected and hasStake === true.
  • CTA is explicit (Migrate); modal is not auto-opened.

• Migration modal wizard

  • Implemented step flow: summary -> bridge/check -> success.
  • Bridge step routes to /microbridge; user returns and triggers status check.
  • On detected hasStake === false, transitions to success and suppresses the popover for that session.

• Surface integration

  • Mounted the shared prompt in both:
    • src/pages/gd/Savings/index.tsx
    • src/pages/gd/Stake/index.tsx
  • Kept existing SavingsModal and StakeDeposit flows intact.

// Shared prompt added to both entry surfaces
<PageLayout title="Savings" faqType="savings">
  <FuseGovernanceMigrationPrompt />
  <gooddollar-savings-widget ref={widgetRef} />
</PageLayout>

Original prompt

Please work on
#640

Product UX

1. Detect Fuse governance stake for connected address.
2. If stake > 0: show Popover (short message + "Migrate" button).
3. Button opens Modal with step wizard — do NOT auto-open modal on page load.
4. After success (Fuse stake 0): hide popover.

Created from VS Code.

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