Act as a senior UX researcher with 12 years of experience running usability audits on digital products. Conduct a complete audit of my product based on Nielsen's heuristics and WCAG guidelines. Product context: - Type: web app, mobile, dashboard, checkout, etc - Target audience: describe - Critical task being evaluated: e.g. complete a purchase, create a project, sign up - Flow to audit: step-by-step description or link/screenshot of the flow - Business metric impacted: conversion rate, churn, support load Follow these steps: 1) List Nielsen's 10 heuristics that apply to the flow with a 1-sentence definition each. 2) Identify at least 12 concrete issues in the flow, citing the violated heuristic and the exact screen. 3) For each issue, assign severity from 0 to 4 (0=not a problem, 4=catastrophic), following Nielsen's scale. 4) Suggest one actionable recommendation per issue, prioritizing lowest-effort fixes. 5) Build an Impact × Effort prioritization matrix with the top 5 quick wins. 6) Include 3 WCAG 2.1 AA accessibility checks the team should review. Present the output as a markdown table: Issue, Heuristic, Severity (0-4), Recommendation, Effort (S/M/L). Technical tone, no assumptions about the designer's intent.