Fix images in changelog not loading

[BlackYps]

Description of the proposed changes

The unit icons for the balance changelog had a broken url, so they didn't load. See: https://faforever.github.io/fa/changelog/fafdevelop
While fixing this I also improved the documentation a little.

Testing done on the proposed changes

In the local environment the images still work, so hopefully they will now also work once we deploy the changes.

Additional context

@lL1l1 can you convert the rest of the balance snippets to the new format? I started doing it, but then I realized there is more important stuff that I should attend to and if I do it then other people don't learn to use the new format.
There are also non-balance snippets that still have the PR number at the start. Could you change these also? Most of them are yours anyway. You can just make a PR with all the changed snippets, then I will review it quickly.

Summary by CodeRabbit

• Balance Updates

  • Reduced the Loyalist T3 Siege Assault Bot’s stun duration against T1/T2 mobile units.
  • Adjusted Novax orbital laser behavior, costs, energy drain, base-station costs, and build time.
  • Replaced Novax Omni detection with sonar.

• Bug Fixes

  • Fixed missing unit icons on the changelog website.

• Documentation

  • Updated quick load hotkey and chat window feature documentation.
  • Improved balance change templates and examples.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 025201ef-4ecd-4acd-b805-d2c41d6b8b5f

📥 Commits

Reviewing files that changed from the base of the PR and between 4b36ba3 and f5b21af.

📒 Files selected for processing (2)

• docs/_plugins/balance_change.rb
• docs/development-changelog/balance-snippet.md

🚧 Files skipped from review as they are similar to previous changes (2)

• docs/development-changelog/balance-snippet.md
• docs/_plugins/balance_change.rb

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📝 Walkthrough

Walkthrough

The PR updates changelog snippet formatting, adds unit-scoped balance examples, changes unit icon paths to relative paths, expands regex documentation, and revises feature and fix entries.

Changes

Changelog formatting

Layer / File(s)	Summary
Snippet format and rendering docs/development-changelog/balance-snippet.md, docs/_plugins/*.rb	The balance snippet template now uses Blueprint IDs and unit-scoped titles. The documentation adds a Novax Center example. Unit icons use relative asset paths, and regex documentation is expanded.
Balance snippet migration changelog/snippets/balance.7121.md, changelog/snippets/balance.7123.md	The Loyalist and Novax balance entries now use unit-tagged blocks.
Changelog entry updates changelog/snippets/features.7066.md, changelog/snippets/features.7098.md, changelog/snippets/other.7202.md	The quick load and chat-window entries were reformatted. A unit-icon loading fix entry was added.

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

Possibly related PRs

• FAForever/fa#7028: Both PRs update the balance snippet format documentation.
• FAForever/fa#7086: This PR extends related unit-tag and balance snippet formatting changes.
• FAForever/fa#7123: This PR reformats the same Novax balance changelog entry.

Suggested labels: area: changelog management, area: documentation

Suggested reviewers: ll1l1

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: fixing images that fail to load in the changelog.
Description check	✅ Passed	The description covers the changes, testing, and additional context, but it omits the template checklist.
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 docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-changelog

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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 `@docs/_plugins/balance_change.rb`:
- Line 17: Update the comment near the balance-list regex in balance_change.rb
to reference unit_block.rb as the implementation responsible for rendering the
unit icon and title, replacing the incorrect self-reference while leaving the
surrounding behavior unchanged.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

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

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: dcacb297-9d7e-4370-8214-6566bde23500

📥 Commits

Reviewing files that changed from the base of the PR and between 658b338 and 4b36ba3.

📒 Files selected for processing (8)

• changelog/snippets/balance.7121.md
• changelog/snippets/balance.7123.md
• changelog/snippets/features.7066.md
• changelog/snippets/features.7098.md
• changelog/snippets/other.7202.md
• docs/_plugins/balance_change.rb
• docs/_plugins/unit_block.rb
• docs/development-changelog/balance-snippet.md