feat(resume): complete Epic 4 - Resume Content Strategy and Guidelines

- Update resume data with comprehensive professional summary and optimized work experience highlights
- Add resume content tech-spec and strategy documentation for 2025 best practices
- Create resume guidelines reference document for content consistency
- Enhance PDF composable with openPdf preview function alongside downloadPdf
- Expand CSS banner hiding rules to block certificates.dev promotional content
- Add research documentation on resume best practices and ATS optimization
- Update i18n translations for resume content in English and Persian
- Include sample Ali Arghyani resume PDF template in design assets
- Refactor resume.en.ts with improved professional positioning and achievement metrics
- Update API route documentation for PDF generation story artifacts
- Establish foundation for Epic 4 sprint planning with tech specifications

docs/sprint-artifacts/tech-spec-epic-4.md

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+# Epic Technical Specification: Resume Content Guidelines
+
+Date: 2025-12-01  
+Author: mahdi  
+Epic ID: 4  
+Status: Draft
+
+---
+
+## Overview
+
+Epic 4 delivers a concise Markdown reference guide for resume content writing based on the comprehensive research in `docs/research/resume-research-2025.md`. This creates a quick-reference document for use while writing resume content.
+
+**Key Value:** Quick reference while writing resume content, ensuring alignment with 2025 best practices without re-reading the full research document.
+
+## Objectives and Scope
+
+**In Scope:**
+- Markdown reference guide with extracted best practices
+- Section-specific tips and formulas
+- Action verbs categorized by use case
+- ATS checklist items
+- Outdated practices to avoid
+- Quantification templates
+
+**Out of Scope:**
+- TypeScript data structures (not needed for reference use)
+- UI components (future)
+- Interactive checklist (future)
+
+## Source Tree Changes
+
+| File | Action | Description |
+|------|--------|-------------|
+| `docs/resume-content-guide.md` | CREATE | Quick reference guide extracted from research |
+
+## Content Structure
+
+The guide will include:
+
+1. **Key Statistics** - Numbers that drive resume strategy
+2. **Section Order** - Recommended order by career stage
+3. **Professional Summary Formula** - 3-line formula with examples
+4. **Action Verbs** - Strong verbs categorized by use case
+5. **Quantification Templates** - Templates for metrics by category
+6. **ATS Checklist** - 20-item optimization checklist
+7. **What to Avoid** - Clichés and outdated practices
+
+## Acceptance Criteria
+
+### AC1: Guide Created
+**Given** the guide file exists at `docs/resume-content-guide.md`  
+**When** I open it  
+**Then** it contains all key extracted content from research
+
+### AC2: Actionable Content
+**Given** I'm writing resume content  
+**When** I reference the guide  
+**Then** I can quickly find relevant tips, verbs, and templates
+
+### AC3: Complete Coverage
+**Given** the guide  
+**When** I review it  
+**Then** it covers: statistics, section order, summary formula, action verbs, quantification templates, ATS checklist, and things to avoid
+
+## Story Breakdown
+
+### Story 4.1: Create Resume Content Guide
+
+**Description:** Create Markdown reference guide with extracted best practices from resume research.
+
+**Acceptance Criteria:**
+- [ ] `docs/resume-content-guide.md` created
+- [ ] All key content from research is captured
+- [ ] Easy to scan and reference
+
+**File to Create:**
+- `docs/resume-content-guide.md`
+
+---
+
+_Generated by BMAD Tech-Spec Workflow_  
+_Date: 2025-12-01_  
+_For: mahdi_