test(vault): Add over-funding regression test

[gerani1]

Adds a regression test to verify that deposits slightly exceeding the funding target are rejected cleanly. Also annotates failing tests resulting from the known storage Enum overlap bug.

Fixes #181

Pull Request Checklist

General

• PR title follows conventional commit format (type(scope): description)
• Branch name follows issue-<number>-<description> format
• Linked to relevant issue(s) with Closes #<number> or Fixes #<number>
• Description clearly explains what changes were made and why
• Breaking changes documented (if applicable)

Code Quality

• Code follows project style guidelines (make fmt passes)
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• No new panic! statements (use panic_with_error! instead)
• Public functions have proper documentation
• Complex logic is explained with comments

Testing

• All existing tests still pass (make test passes)
• New functionality is covered by tests
• Test coverage meets minimum requirements (90%+ for new features)
• Tests follow naming conventions (test_<functionality>_scenario)
• Edge cases and error conditions are tested

Security & Events

• Access control properly implemented and tested
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• Input validation is comprehensive
• Reentrancy protection where needed
• CEI pattern (Checks-Effects-Interactions) followed

Documentation

• README updated (if applicable)
• API documentation updated (if applicable)
• Architecture docs updated (if applicable)
• Examples added or updated (if applicable)

Description

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Security improvement

Testing

Security Considerations

Screenshots / Diagrams

Additional Context

Reviewer Focus Areas

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