chore: update claude model selector

[janburzinski]

Description

• update claude model options: opus 4.8,sonnet 5, fable 5

Screenshot/Recording (if applicable)

https://cap.link/rc2ntesdzbhaa0f

Checklist

• I kept this PR small and focused
• I ran a self-review before opening this PR
• I ran the relevant local checks or explained why not
• I updated docs when behavior or setup changed
• I added or updated tests when behavior changed, or explained why not
• I only added comments where the logic is not obvious
• I used Conventional Commits for commit
  messages and, when possible, the PR title

[greptile-apps]

Greptile Summary

Updates the Claude model selector to add three newer models (claude-fable-5, claude-opus-4-8, claude-sonnet-5) and removes the superseded claude-opus-4-5 and claude-sonnet-4-5 entries. The change is applied consistently across the plugin registry, conversation-config JSDoc, tests, and all Storybook stories.

• packages/plugins/src/agents/impl/claude/index.ts gains claude-fable-5 as a new balanced-tier entry alongside updated Opus and Sonnet IDs; claude-haiku-4-5 is intentionally left in place.
• All Storybook mock datasets and default useState seeds are updated to the new model keys, keeping the UI stories in sync with the real plugin registry.
• Test fixtures in conversation-config.test.ts are updated to use the new model strings; a stale anthropic/claude-sonnet-4-5 reference remains in pty-env.test.ts for the unrelated opencode agent and was not changed.

Confidence Score: 5/5

Safe to merge — all changes are model ID string updates with no logic modifications.

The diff is a mechanical rename of model identifiers across the plugin registry, test fixtures, and Storybook stories. All three new model IDs (claude-fable-5, claude-opus-4-8, claude-sonnet-5) are confirmed valid Anthropic API identifiers. The only loose end is a stale anthropic/claude-sonnet-4-5 string in pty-env.test.ts that belongs to a different agent and was not touched by this PR.

No files require special attention. The single comment on pty-env.test.ts is a non-blocking housekeeping note about an unrelated agent's test fixture.

Important Files Changed

Filename	Overview
packages/plugins/src/agents/impl/claude/index.ts	Adds claude-fable-5 and replaces claude-opus-4-5/claude-sonnet-4-5 with claude-opus-4-8/claude-sonnet-5; claude-haiku-4-5 remains unchanged.
apps/emdash-desktop/src/shared/core/conversations/conversation-config.ts	Updates JSDoc example model name from claude-sonnet-4-5 to claude-sonnet-5; no logic changes.
apps/emdash-desktop/src/shared/core/conversations/conversation-config.test.ts	Updates test fixtures to use new model IDs (claude-sonnet-5, claude-opus-4-8); all test cases updated consistently.
packages/ui/src/react/components/chat-composer/chat-composer.stories.tsx	Updates Storybook mock model data; adds claude-fable-5 entry and renames existing models to new IDs.
packages/ui/src/react/components/combobox-popover/combobox-popover.stories.tsx	Updates Storybook MODELS array and default state values to use new model IDs including the new claude-fable-5 entry.
packages/ui/src/react/examples/chat-panel.stories.tsx	Updates MOCK_MODELS and default selected model to match new model IDs; mirrors changes in chat-composer stories.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Claude Plugin Model Registry] --> B[claude-fable-5\nIntelligence: 4, Speed: 3\n🆕 Added]
    A --> C[claude-opus-4-8\nIntelligence: 5, Speed: 2\n🔄 was claude-opus-4-5]
    A --> D[claude-sonnet-5\nIntelligence: 4, Speed: 4\n🔄 was claude-sonnet-4-5]
    A --> E[claude-haiku-4-5\nIntelligence: 3, Speed: 5\n✅ Unchanged]

    F[conversation-config.ts] -- JSDoc example updated --> D
    G[conversation-config.test.ts] -- Test fixtures updated --> C
    G -- Test fixtures updated --> D
    H[UI Stories] -- Mock data updated --> B
    H -- Mock data updated --> C
    H -- Mock data updated --> D

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flowchart TD
    A[Claude Plugin Model Registry] --> B[claude-fable-5\nIntelligence: 4, Speed: 3\n🆕 Added]
    A --> C[claude-opus-4-8\nIntelligence: 5, Speed: 2\n🔄 was claude-opus-4-5]
    A --> D[claude-sonnet-5\nIntelligence: 4, Speed: 4\n🔄 was claude-sonnet-4-5]
    A --> E[claude-haiku-4-5\nIntelligence: 3, Speed: 5\n✅ Unchanged]

    F[conversation-config.ts] -- JSDoc example updated --> D
    G[conversation-config.test.ts] -- Test fixtures updated --> C
    G -- Test fixtures updated --> D
    H[UI Stories] -- Mock data updated --> B
    H -- Mock data updated --> C
    H -- Mock data updated --> D

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_{Reviews (1): Last reviewed commit: "chore(ui): revert story model updates" | Re-trigger Greptile}