fix(web): add HTTP security headers to all responses

[msukkari]

Fixes SOU-1466

Summary by CodeRabbit

• Bug Fixes
  • Added security-related HTTP response headers to all web app pages, including protections for framing, content sniffing, transport security, referrer handling, and device access.
  • Strengthened response security with a content policy that limits where the app can be embedded.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: bf314634-1bda-47b8-b655-54bd7ad35864

📥 Commits

Reviewing files that changed from the base of the PR and between 5466592 and 738cdf4.

📒 Files selected for processing (1)

• CHANGELOG.md

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Walkthrough

Adds an async headers() function to nextConfig in packages/web/next.config.mjs that applies HTTP security headers to all routes, and adds a changelog entry documenting the change.

Changes

Security Headers Configuration

Layer / File(s)	Summary
Add headers() hook and changelog entry packages/web/next.config.mjs, CHANGELOG.md	Adds a headers() function returning HSTS, X-Content-Type-Options, X-Frame-Options, Referrer-Policy, Permissions-Policy, and CSP frame-ancestors headers for all routes, and adds a corresponding Fixed entry to the changelog.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding HTTP security headers to all web responses.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch michael/security-headers-SOU-1466

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@CHANGELOG.md`:
- Line 29: The changelog entry has mismatched PR metadata: the visible pull
request id and the linked URL point to different PRs. Update the markdown link
in the CHANGELOG entry so the displayed `#<id>` and the `pull/<id>` target use
the same correct PR number, following the existing
`[#<id>](https://github.com/sourcebot-dev/sourcebot/pull/<id>)` format.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: add0a45d-490c-46ec-a746-6e0c9e483f66

📥 Commits

Reviewing files that changed from the base of the PR and between ff4b389 and 5466592.

📒 Files selected for processing (2)

• CHANGELOG.md
• packages/web/next.config.mjs