Fix typo and optional chaining in pendingRequests tracking

[Copilot]

Addresses feedback on PR #357 regarding a typo (pendingRquests → pendingRequests) and missing null safety when accessing this.form.

Changes

• Fixed typo: Corrected pendingRquests → pendingRequests in source and tests
• Added null guard: Wrapped uploadHandler() form access in if (this.form) check to prevent TypeError
• Fixed Promise.all(): Added || [] fallback to handle undefined pendingRequests array

Code Changes

Before:

async submitHandler(event) {
  await Promise.all(this.form?.pendingRquests)  // typo + undefined throws
}

uploadHandler() {
  this.form.pendingRquests = this.form?.pendingRquests || []  // missing null check on LHS
  this.form.pendingRquests.push(this.upload)
}

After:

async submitHandler(event) {
  await Promise.all(this.form?.pendingRequests || [])  // fixed typo + fallback
}

uploadHandler() {
  if (this.form) {  // null guard
    this.form.pendingRequests = this.form.pendingRequests || []
    this.form.pendingRequests.push(this.upload)
  }
}

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