refactor(mobile): reuse shared inbox transport

[richardsolomou]

Problem

Mobile maintains a second implementation of the signals inbox HTTP API even though desktop already uses the shared authenticated API client. Endpoint and error behavior can therefore drift between hosts.

Changes

Route mobile inbox queries and mutations through the shared API client used by desktop. Keep only native query wiring, move repository artefact interpretation into core, and remove the duplicated report transport implementation.

How did you test this?

• Core test suite (2,633 tests)
• Core typecheck
• Mobile test suite (340 tests)
• 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 no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit fcec203.}