fix: agentic apply — scroll, form detection, AI field filling, preview, and submit flow

[Mayank-glitch-cpu]

Problem

The current agentic apply workflow has several blockers that prevent it from working end-to-end:

1. Playwright doesn't scroll — on listing pages (Greenhouse, Lever, Ashby job boards), the Apply button is below the fold and Playwright never scrolls to find it, so the inspector sees 0 fields
2. No click-through from listing → form — the agent lands on the job description page, not the application form. It needs to click the Apply/Apply for this Job CTA and follow any redirect or new-tab navigation
3. Form field detection is unreliable — DOM selector extraction misses JS-rendered inputs (Ashby, Greenhouse iframes), custom radio groups, and multi-page wizard steps
4. AI answers not generated for open-text fields — cover letter, "Why this company?", motivational essay fields are left blank instead of being auto-filled with profile-aware responses
5. Resume upload not wired — resumePath in personal.json is mapped but the file input selector often doesn't match, so the PDF never gets attached
6. No persistent form state — there is no saved state between inspect and submit; if the LLM re-navigates, everything resets
7. No in-chat preview before submit — the agent should show a table of every field + value and wait for user confirmation before clicking Submit

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Acceptance Criteria

• Scroll + Apply CTA click — Playwright scrolls the full page, detects the Apply/Apply for this Job button, clicks it, and lands on the actual application form (same-page, new-tab, or iframe)

• Field detection works on:

  • Ashby (jobs.ashbyhq.com) — React-rendered, form at {listing}/application
  • Greenhouse (boards.greenhouse.io) — form may be in an iframe
  • Workday (myworkdayjobs.com) — multi-step wizard (bonus)

• All required fields filled using personal.json:

  • First name, last name, email, phone
  • LinkedIn, GitHub, portfolio URL
  • Work authorization + sponsorship radio/select
  • City, state, country

• Resume uploaded — resumePath from personal.json is correctly set on the file input; PDF attaches successfully

• AI-generated answers for open-text fields (cover letter, "Why this company?", "Tell us about yourself") using the user's experience.md, skills.md, projects.md — 150–300 words, personalized to the company

• In-chat preview table shown before submit:

  Field	Value
  First Name	Mayank
  Email	mvyas7@asu.edu
  Cover Letter	I'm excited about Glean be…

  Agent waits for user to say "yes" / "apply" before submitting

• Stored form state — filled values are persisted so saying "apply" after reviewing re-uses the same state without re-navigating

• Post-submit confirmation — agent detects success page text and calls pipeline_mark_applied

Acceptance Gate

• Screen recording showing a full apply run (inspect → AI fill → preview → submit → confirmation) on at least Ashby and Greenhouse
• Workday working is a bonus (multi-step wizard support)
• No crashes, no blank required fields, resume visibly attached in the recording

Affected files

• mcp-server/src/lib/browser-apply.ts — scroll, click-through, iframe handling, file upload
• mcp-server/src/tools/apply-tools.ts — form state persistence between inspect and submit
• mcp-server/src/prompts/index.ts — AUTO_APPLY_WORKFLOW and PIPELINE_DASHBOARD inline apply steps