fix: update stale Sonnet 4.6 labels to Sonnet 5 in the model picker

[zscgeek]

Summary

The Claude model picker shows "Sonnet 4.6" everywhere (default description, Sonnet option, Sonnet 1M-context option), which makes it look like Sonnet 5 isn't available. It actually already is — the underlying `sonnet` alias resolves live, server-side, to whatever the current Sonnet model is:

```
$ claude --model sonnet -p "what model are you, exactly (full model id)?"
Sonnet 5, model ID `claude-sonnet-5`.
```

The Opus entries were already updated to say "Opus 4.8" in a previous pass — Sonnet's labels were simply missed.

Fix

Label-only change in `CLAUDE_FALLBACK_MODELS` (`claude-models.provider.ts`): updates the three "Sonnet 4.6" description strings (`default`, `sonnet`, `sonnet[1m]`) to "Sonnet 5". The `value` fields themselves are untouched — those aliases are resolved by Claude Code CLI itself and are already correct.

Testing

• `npm run typecheck` — clean
• `npm run lint` — no new errors
• Verified the alias resolution directly against the installed `claude` CLI (see command above)

Summary by CodeRabbit

• Documentation
  • Updated model descriptions to reference Claude Sonnet 5 for the default, Sonnet, and extended-context options.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: b70ca678-ac8d-4aeb-bfe5-c862e9a6d403

📥 Commits

Reviewing files that changed from the base of the PR and between 27eaf01 and a9a4993.

📒 Files selected for processing (1)

• server/modules/providers/list/claude/claude-models.provider.ts

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📝 Walkthrough

Walkthrough

Changes

Claude model catalog

Layer / File(s)	Summary
Update fallback model descriptions server/modules/providers/list/claude/claude-models.provider.ts	The default, Sonnet, and sonnet[1m] descriptions now reference Claude Sonnet 5; model-selection logic is unchanged.

Possibly related PRs

• siteboon/claudecodeui#806: Updates related Claude fallback-model catalog entries.
• siteboon/claudecodeui#834: Changes human-readable Claude model descriptions without modifying provider logic.

Suggested reviewers: viper151

Poem

A rabbit updates the model sign,
“Sonnet Five” now reads just fine.
Default and long-context hop,
Clearer labels at each stop.
No logic changed—just words in line!

🚥 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 accurately and concisely describes the label-only update from Sonnet 4.6 to Sonnet 5 in the model picker.
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

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