修改README跟吉祥物

[Retsomm]

Summary by CodeRabbit

• Documentation

  • Updated project documentation with comprehensive setup and development guidance.

• New Features

  • Added greeting mascot overlay that displays during audio teaching sessions.
  • Improved live caption display behavior based on active call status.

• Style

  • Updated mascot and lesson artwork assets throughout the app.

[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: d1d1afa8-632a-480b-84e4-9246cdf5d391

📥 Commits

Reviewing files that changed from the base of the PR and between f358e16 and db68b64.

⛔ Files ignored due to path filters (2)

• assets/images/lesson-cafe-scene-mascot.png is excluded by !**/*.png
• assets/images/mascot-pink-creature.png is excluded by !**/*.png

📒 Files selected for processing (3)

• README.md
• components/audio-teacher-session.tsx
• constants/images.ts

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📝 Walkthrough

Walkthrough

Image assets are consolidated from multiple mascot sources to a single pink creature reference. The audio session UI now conditionally renders a greeting overlay with mascot when live captions are inactive, controlled by a call-in-progress flag. Project documentation is rewritten to describe the Lingua app structure and setup.

Changes

Greeting Overlay and Asset Consolidation

Layer / File(s)	Summary
Image asset consolidation constants/images.ts	Multiple mascot imports (mascotLogo, mascotAuth, mascotWelcome, aiTeacherFoxSweater) and lesson scene assets are consolidated: mascot references now point to mascotPinkCreature, teacherPortrait uses mascotPinkCreature, and lessonArt maps cafe/cafeScene to lessonCafeSceneMascot with completed using mascotPinkCreature.
Greeting overlay UI and live caption gating components/audio-teacher-session.tsx	Audio session introduces shouldShowLiveCaptions (set when call is in progress) to conditionally render either the live caption transcript with auto-scroll or a centered greeting overlay displaying mascot and text. Greeting mascot size is computed from viewport width, and a new greetingBubble style provides shadow/z-index styling.
Project documentation README.md	README is rewritten from Expo starter template to a Lingua-specific guide covering app concept, features, technical stack, folder structure, environment variable setup (Clerk, Stream, Vision Agent, PostHog), Vision Agent service running, app routing/user flow, local data model conventions, styling rules, API route descriptions, quality-check commands, and development/security guidance.

Estimated Code Review Effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly Related PRs

• Retsomm/react-native-lingua#12: Refactors audio-teacher-session.tsx to introduce live caption-driven transcript UI and call/speaking flow, directly overlapping with this PR's live caption state gating and greeting overlay conditional rendering.
• Retsomm/react-native-lingua#7: Modifies the teacherPortrait entry in constants/images.ts; this PR remaps it to mascotPinkCreature while the retrieved PR maps it to mascotAuth.
• Retsomm/react-native-lingua#9: Also touches components/audio-teacher-session.tsx to introduce/rework the AudioTeacherSession screen itself, providing context for this PR's greeting overlay and live caption behavior updates.

Poem

A pink creature greets with mascot cheer,
When lessons pause and captions disappear,
One image consolidated, clean and bright,
The UI blooms—a greeting just right! 🐰✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main changes: updating the README with project-specific documentation and consolidating mascot asset references.
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.

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✨ 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 dev

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