docs(llc): add Stories integration code snippets

[renefloor]

Summary

• Adds docs/code_snippets/03_04_stories.dart with end-to-end Stories examples
• Covers: posting a story (activity with expiresAt), reading the stories aggregation feed, filtering stories vs regular posts with Filter.exists(ActivitiesFilterField.expiresAt, ...), marking a story watched, and following another user's story feed

Relevance check

All SDK building blocks were already present: FeedId.stories/FeedId.story, expiresAt on FeedAddActivityRequest/ActivityData, ActivitiesFilterField.expiresAt, Filter.exists, and StoriesFeedUpdatedEvent WS handling in the state layer. This PR adds only the missing documentation snippet.

Test plan

• melos run analyze — no issues (docs snippet compiles cleanly)

Closes FLU-378

🤖 Generated with Claude Code

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: bd31e35a-77a3-47f6-a658-f5ddf00dc593

📥 Commits

Reviewing files that changed from the base of the PR and between a1590dd and 5974186.

📒 Files selected for processing (1)

• docs/code_snippets/03_04_stories.dart

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch renefloor/flu-378-add-flutter-feeds-stories-integration-docsexample

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.53%. Comparing base (a1590dd) to head (5974186).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #109   +/-   ##
=======================================
  Coverage   85.53%   85.53%           
=======================================
  Files         124      124           
  Lines        4342     4342           
=======================================
  Hits         3714     3714           
  Misses        628      628           

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