docs: refresh media assets, embed setup screenshot, promote downloads badge

[elkaix]

Summary

• Regenerate docs/media/shell-mode.gif from a new recording (ffmpeg palette pipeline, 860px/10fps, 3.1 MB) and refresh docs/media/setup.png
• Embed the setup screenshot (login provider picker) in the README Authenticate section
• Promote the PyPI downloads badge to the primary badge row using the shields.io pepy endpoint (for-the-badge style)

Docs/media only — no shipped code paths touched, so no changelog entry is required.

[skip changelog]

Summary by CodeRabbit

• Documentation
  • Updated the project’s download statistics badge and destination link.
  • Added a visual example of the login provider selection screen to the authentication instructions.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 134a04c3-49d0-4196-a187-547b2363b3c3

📥 Commits

Reviewing files that changed from the base of the PR and between 9700655 and 6391725.

⛔ Files ignored due to path filters (2)

• docs/media/setup.png is excluded by !**/*.png, !docs/**
• docs/media/shell-mode.gif is excluded by !**/*.gif, !docs/**

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

README badges were updated, and the optional authentication section now includes a centered image showing the login provider picker.

Changes

README updates

Layer / File(s)	Summary
Downloads badge update README.md	The PyPI downloads badge and link were replaced with a Pepy/shields downloads badge while preserving the surrounding badges.
Authentication setup visual README.md	A centered setup.png image was added after the pythinker login example.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested labels: documentation

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description omits the required Related Issue section and checklist, and it doesn't follow the repository template.	Add the Related Issue block with Resolve #(issue_number), keep the Description section, and include the checklist items from the template.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title uses a valid conventional-commit prefix and accurately summarizes the documentation/media updates.
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 docs/refresh-media-and-badges

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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