Add background filtering jobs, improved date picker, AI reasoning display

- Implement background job system for AI filtering to avoid HTTP timeouts
- Add FilteringJob model to track progress of long-running filtering operations
- Add real-time progress polling for filtering operations on round details page
- Create custom DateTimePicker component with calendar popup (no year picker hassle)
- Fix round date persistence bug (refetchOnWindowFocus was resetting form state)
- Integrate filtering controls into round details page for filtering rounds
- Display AI reasoning for flagged/filtered projects in results table
- Add onboarding system scaffolding (schema, routes, basic UI)
- Allow setting round dates in the past for manual overrides

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/lib/email.ts

@@ -470,6 +470,98 @@ Together for a healthier ocean.
   }
 }
 
+/**
+ * Generate application confirmation email template
+ */
+function getApplicationConfirmationTemplate(
+  name: string,
+  projectName: string,
+  programName: string,
+  customMessage?: string
+): EmailTemplate {
+  const greeting = name ? `Hello ${name},` : 'Hello,'
+
+  const customMessageHtml = customMessage
+    ? `<div style="color: ${BRAND.textDark}; font-size: 15px; line-height: 1.7; margin: 20px 0; padding: 20px; background-color: ${BRAND.lightGray}; border-radius: 8px;">${customMessage.replace(/\n/g, '<br>')}</div>`
+    : ''
+
+  const content = `
+    ${sectionTitle(greeting)}
+    ${paragraph(`Thank you for submitting your application to <strong style="color: ${BRAND.darkBlue};">${programName}</strong>!`)}
+    ${infoBox(`Your project "<strong>${projectName}</strong>" has been successfully received.`, 'success')}
+    ${customMessageHtml}
+    ${paragraph('Our team will review your submission and get back to you soon. In the meantime, if you have any questions, please don\'t hesitate to reach out.')}
+    <p style="color: ${BRAND.textMuted}; margin: 24px 0 0 0; font-size: 13px; text-align: center;">
+      You will receive email updates about your application status.
+    </p>
+  `
+
+  return {
+    subject: `Application Received - ${projectName}`,
+    html: getEmailWrapper(content),
+    text: `
+${greeting}
+
+Thank you for submitting your application to ${programName}!
+
+Your project "${projectName}" has been successfully received.
+
+${customMessage || ''}
+
+Our team will review your submission and get back to you soon. In the meantime, if you have any questions, please don't hesitate to reach out.
+
+---
+Monaco Ocean Protection Challenge
+Together for a healthier ocean.
+    `,
+  }
+}
+
+/**
+ * Generate team member invite email template
+ */
+function getTeamMemberInviteTemplate(
+  name: string,
+  projectName: string,
+  teamLeadName: string,
+  inviteUrl: string
+): EmailTemplate {
+  const greeting = name ? `Hello ${name},` : 'Hello,'
+
+  const content = `
+    ${sectionTitle(greeting)}
+    ${paragraph(`<strong>${teamLeadName}</strong> has invited you to join their team for the project "<strong style="color: ${BRAND.darkBlue};">${projectName}</strong>" on the Monaco Ocean Protection Challenge platform.`)}
+    ${paragraph('Click the button below to accept the invitation and set up your account.')}
+    ${ctaButton(inviteUrl, 'Accept Invitation')}
+    ${infoBox('This invitation link will expire in 30 days.', 'info')}
+    <p style="color: ${BRAND.textMuted}; margin: 24px 0 0 0; font-size: 13px; text-align: center;">
+      If you weren't expecting this invitation, you can safely ignore this email.
+    </p>
+  `
+
+  return {
+    subject: `You've been invited to join "${projectName}"`,
+    html: getEmailWrapper(content),
+    text: `
+${greeting}
+
+${teamLeadName} has invited you to join their team for the project "${projectName}" on the Monaco Ocean Protection Challenge platform.
+
+Click the link below to accept the invitation and set up your account:
+
+${inviteUrl}
+
+This invitation link will expire in 30 days.
+
+If you weren't expecting this invitation, you can safely ignore this email.
+
+---
+Monaco Ocean Protection Challenge
+Together for a healthier ocean.
+    `,
+  }
+}
+
 // =============================================================================
 // Email Sending Functions
 // =============================================================================
@@ -634,3 +726,57 @@ export async function verifyEmailConnection(): Promise<boolean> {
     return false
   }
 }
+
+/**
+ * Send application confirmation email to applicant
+ */
+export async function sendApplicationConfirmationEmail(
+  email: string,
+  applicantName: string,
+  projectName: string,
+  programName: string,
+  customMessage?: string
+): Promise<void> {
+  const template = getApplicationConfirmationTemplate(
+    applicantName,
+    projectName,
+    programName,
+    customMessage
+  )
+  const { transporter, from } = await getTransporter()
+
+  await transporter.sendMail({
+    from,
+    to: email,
+    subject: template.subject,
+    text: template.text,
+    html: template.html,
+  })
+}
+
+/**
+ * Send team member invite email
+ */
+export async function sendTeamMemberInviteEmail(
+  email: string,
+  memberName: string,
+  projectName: string,
+  teamLeadName: string,
+  inviteUrl: string
+): Promise<void> {
+  const template = getTeamMemberInviteTemplate(
+    memberName,
+    projectName,
+    teamLeadName,
+    inviteUrl
+  )
+  const { transporter, from } = await getTransporter()
+
+  await transporter.sendMail({
+    from,
+    to: email,
+    subject: template.subject,
+    text: template.text,
+    html: template.html,
+  })
+}