Add favicon fallback for browser compatibility

[kjanat]

Chores

• Implemented automated favicon generation workflow that updates favicon when the application icon changes, supporting multiple resolutions.
• Integrated favicon link into the site template for consistent display across browsers and devices.

Summary by CodeRabbit

• Chores
  • Implemented automated favicon generation and deployment workflow.
  • Updated site template to properly display favicon across all pages.

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Walkthrough

Adds an automated GitHub Actions workflow that converts logo/icon.svg to a multi-size favicon.ico, conditionally opens a pull request with the regenerated files, and a template override that injects a favicon link into the site HTML head.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflow ​.github/workflows/favicon.yml	New workflow "Update Favicon": triggers on logo/icon.svg changes and manual dispatch; runs on ubuntu-latest, installs ImageMagick, converts logo/icon.svg to multi-size docs/assets/images/favicon.ico and docs/favicon.ico, diffs results, and opens a PR with peter-evans/create-pull-request@v8 if files changed.
Template Override site/overrides/main.html	New template override extending base.html that inserts a <link rel="icon" href="{{ url('favicon.ico') }}"> (via extrahead block) to reference the generated favicon.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  actor Trigger as "Push / workflow_dispatch"
  participant Actions as "GitHub Actions"
  participant Runner as "Ubuntu Runner"
  participant IM as "ImageMagick"
  participant Repo as "Repository"
  participant PRAction as "create-pull-request Action"

  Trigger->>Actions: workflow starts
  Actions->>Runner: run update-favicon job
  Runner->>Repo: checkout repository
  Runner->>IM: convert `logo/icon.svg` -> multi-size `favicon.ico` files
  IM-->>Runner: generated `docs/assets/images/favicon.ico`, `docs/favicon.ico`
  Runner->>Runner: diff generated files vs repo files
  alt changes detected
    Runner->>PRAction: create branch, commit updated favicon files
    PRAction->>Repo: push branch and open pull request
  else no changes
    Runner-->>Actions: exit without PR
  end

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title mentions 'favicon fallback for browser compatibility', but the PR primarily implements automated favicon generation and template integration—broader than just adding fallback support.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch claude/add-favicon-fallback-qUaBc

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