refactor(mobile): share composer control semantics

[richardsolomou]

Problem

Desktop and mobile interpret cloud composer model options, restricted selections, reasoning compatibility, and primary actions through separate code paths. This allows the same task configuration to behave differently across hosts.

Changes

Move model-option presentation, restricted-model fallback, reasoning compatibility, labels, and send/stop/microphone action selection into portable core helpers. Adopt those helpers in desktop and mobile immediately, and remove the mobile-only options module.

How did you test this?

• Focused core composer tests
• Focused mobile config tests
• Core and UI typechecks
• Biome on changed files
• Host-boundary check

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

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Created with PostHog Code

[github-actions]

React Doctor found 10 issues in 2 files · 10 warnings.

10 warnings

src/app/task/index.tsx

• ⚠️ src/app/task/index.tsx:218 Event logic handled in an effect no-event-handler
• ⚠️ src/app/task/index.tsx:219 Event logic handled in an effect no-event-handler
• ⚠️ src/app/task/index.tsx:221 Derived value copied into state no-derived-state
• ⚠️ src/app/task/index.tsx:222 Derived value copied into state no-derived-state

src/features/tasks/composer/TaskChatComposer.tsx

• ⚠️ src/features/tasks/composer/TaskChatComposer.tsx:212 Event logic handled in an effect no-event-handler
• ⚠️ src/features/tasks/composer/TaskChatComposer.tsx:213 Event logic handled in an effect no-event-handler
• ⚠️ src/features/tasks/composer/TaskChatComposer.tsx:215 Data passed to parent via effect no-pass-data-to-parent
• ⚠️ src/features/tasks/composer/TaskChatComposer.tsx:215 Parent kept in sync with a callback effect no-prop-callback-in-effect
• ⚠️ src/features/tasks/composer/TaskChatComposer.tsx:216 Data passed to parent via effect no-pass-data-to-parent
• ⚠️ src/features/tasks/composer/TaskChatComposer.tsx:216 Parent kept in sync with a callback effect no-prop-callback-in-effect

_{Reviewed by React Doctor for commit 2f7181a.}