fix: enforce unwrap daily limit

[ZaerCompany]

Fixes #137

Summary

• fetch and store the remaining unwrap daily limit immediately when Ethereum -> Tari is selected
• refresh the stored value every 30 seconds so input validation receives the live limit
• stop the unwrap path before wallet signature / contract submission when the amount exceeds the remaining limit, including a zero remaining limit
• clear the stale warning state when a later preflight check passes

Context

This restores the protection originally added in #96. During the later store cleanup, the polling hook's returned value stopped being written to remainingDailyLimit, and the final preflight guard was reduced to an inert new Error(...) expression with no control-flow exit.

Verification

• git diff --check origin/development...HEAD
• code-path audit: the UI updater now calls setRemainingDailyLimit(await fetchDailyLimit()) immediately and on the interval; the final guard returns before parseEther, typed-data signing, and writeContract

Local validation constraint

npm ci --ignore-scripts --no-audit --no-fund could not complete in this environment because @tari-project/wxtm-bridge-contracts@0.1.12 is served from GitHub Packages and the available token does not have the required package-read scope. Please run the normal build in the maintainer environment with package access.

[github-actions]

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[gemini-code-assist]

Code Review

This pull request refactors the daily limit fetching and validation logic. In app/page.tsx, the daily limit is now fetched immediately on mount and updated periodically. In hooks/use-bridge-to-tari.ts, the limit check was simplified to return a boolean instead of instantiating an unused error. Feedback points out that removing the limitXtm check could allow transactions to bypass the limit if the value is undefined or NaN, and recommends adding an active flag to the asynchronous useEffect hook to prevent state updates on unmounted components.