Implement command palette invoice search

[king-aj-the-first]

Background: CommandPalette.tsx exists but only handles navigation. It should also search invoices by debtor name, invoice ID, or amount.

What "done" looks like:

• Typing in the command palette shows invoice results filtered by debtor name, token ID, or face value
• Selecting a result navigates to /marketplace/[id]
• Results are debounced (300ms) to avoid hammering the store

Key files: components/command/CommandPalette.tsx, hooks/useCommandPalette.ts, store/invoiceStore.ts

Constraints:

• Search is client-side against loaded invoices — no new API calls
• Results show invoice status badge and funded % alongside the name
• Keyboard navigation (↑↓ arrows, Enter to select) must work

PR must include: Search integration + keyboard nav + tests.

[web3nova]

@web3nova has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi Maintainer, I have reviewed the description of the issue and would like to hop on this issue and deliver ETA

ℹ️ Repo Maintainers: To accept this application, review their application or assign @web3nova to this issue.

[originaldefiboy]

@originaldefiboy has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hey maintainer i am familiar with this task kindly assign issue to me.
Thank you

ℹ️ Repo Maintainers: To accept this application, review their application or assign @originaldefiboy to this issue.

[drips-wave]

Congratulations, @originaldefiboy! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @originaldefiboy: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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