Export observations as PDF and CSV

[bgorzelic]

Description

Allow users to export their observations in two formats:

• PDF — Formatted like the NWCG fire behavior observation worksheet, suitable for printing and attaching to incident reports
• CSV — Tabular export of all observations for analysis in Excel, Google Sheets, or GIS tools

Proposed Implementation

PDF Export

• Use @react-pdf/renderer or jspdf for client-side PDF generation
• Template mirrors the physical NWCG form layout
• Include all fields: incident info, environment, wind/slope (with calculated EWS), ROS, LCES checklist, log entries
• Fire-themed header with Firevector branding
• Add "Export PDF" button on individual observation view

CSV Export

• Server action that queries all user observations
• Standard CSV with headers matching the observation columns
• Include both raw and calculated values
• Add "Export All (CSV)" button on dashboard

Acceptance Criteria

• PDF export generates a professional NWCG-style form
• CSV export includes all observations with calculated fields
• Exports work on mobile and desktop
• PDF includes log entries in a table
• CSV handles special characters and commas in text fields
• Loading state during generation
• File downloads with meaningful filename (e.g., creek-fire-observation-2024-09-05.pdf)