fix: Prevent election creation with past start dates

[sai-suraj143]

Description

Previously, the election creation form allowed users to select a "Start Date" in the past. The form would fail silently (no election created, no error shown). This PR adds a validation check to ensure startTime >= CurrentTime. If a past date is selected, a Toast error is displayed to the user.

Type of Change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Tested locally by attempting to create an election with yesterday's date.
• Verified that the error "Invalid timing. Start time cannot be in the past." appears.
• Verified that valid future dates still work correctly.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code

Closes #210

Summary by CodeRabbit

Release Notes

• Improvements
  • Network switching now validates Crypto Wallet availability. Users receive guidance and installation options if their wallet isn't connected.
  • Election creation prevents past start times with error notifications when invalid dates are selected.

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[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Added runtime validations to the election creation flow: a wallet (window.ethereum) presence check in changeChain that prompts MetaMask download if absent, and a start time validation in createElection that prevents creating elections with past start dates. Both failed validations display error toasts.

Changes

Cohort / File(s)	Summary
Election Creation Validations client/app/create/page.tsx	Added wallet presence check in changeChain to require Crypto Wallet; displays error toast and prompts MetaMask download if missing. Added start time validation in createElection to prevent past dates; displays error toast if start time is before current time.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

• Straightforward validation additions with no complex logic or side effects
• Single file with two isolated validation checks (wallet presence and date comparison)
• May want to verify error messaging alignment and date comparison logic accuracy

Poem

🐰 A hop, a skip, through forms so neat,
With wallets checked and dates complete!
No past-cast votes or missing keys,
Just errors shown with gentle ease. ✨

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 2d3a4dd and c460646.

📒 Files selected for processing (1)

• client/app/create/page.tsx

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