fix(api): neutralize formula injection in the issue export

[cavidelizade]

Summary

Issue, project and state names were written straight into spreadsheet cells, so a work item title like =HYPERLINK(...), +cmd, -2+3 or @SUM(...) became a live formula when the exported .xlsx was opened in Excel, LibreOffice or Sheets. Titles are user-controlled, so anyone who can create an issue could plant one and whoever exported and opened the file would trigger it.

Linked issues

Closes #331

Type of change

• Bug fix (fix:)

Surface

• API (apps/api/)

What changed

Added neutralizeFormula, which prefixes any cell text starting with =, +, -, @, tab or CR with a single quote so the spreadsheet treats it as literal text. Applied it to every cell value in the workbook builder. Non-string values pass through untouched.

Test plan

• go build, go vet, go test ./... green, including the new TestNeutralizeFormula

AI assistance

• AI tools were used, tool(s): Claude Code (Opus 4.8), commits carry a Co-Authored-By: trailer

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 5e55b829-a16e-4fb1-b3a2-e731f7696259

📥 Commits

Reviewing files that changed from the base of the PR and between 61bc903 and 9793256.

📒 Files selected for processing (2)

• apps/api/internal/service/export.go
• apps/api/internal/service/export_formula_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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