fix: add missing @keyframes shake animation

[Siddh2024]

Fixes #529 - adds the @Keyframes shake CSS rule referenced by shakeElement() in popup.ts

Summary by CodeRabbit

• Style
  • Added a subtle shake animation that can be used by popup interface elements.

[github-actions]

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[github-actions]

👋 Thank you @Siddh2024 for your contribution to Late-Meet!

✅ Verified: You are assigned to the linked issue #529.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e129ba82-7d7e-42b6-a9b6-4a8ed0f7b713

📥 Commits

Reviewing files that changed from the base of the PR and between d216444 and c180ac0.

📒 Files selected for processing (1)

• src/popup.css

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📝 Walkthrough

Walkthrough

Adds the missing shake CSS animation to src/popup.css, defining horizontal translations at intermediate keyframes and returning to the original position.

Changes

Popup feedback

Layer / File(s)	Summary
Define popup shake animation src/popup.css	Adds @keyframes shake with left-right translateX transitions from 0px to -5px, then +5px, and back to 0px.

Estimated code review effort: 1 (Trivial) | ~2 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 the missing shake animation.
Linked Issues check	✅ Passed	The change adds the missing @keyframes shake rule in popup.css, matching issue #529 and restoring invalid-input feedback.
Out of Scope Changes check	✅ Passed	The PR stays focused on the missing shake animation and introduces no unrelated changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud