* chore(lint): bump oxlint to 1.91, add perf lint rules and perf audits
* fix(lint): await promises returned inside try/catch/finally for return-await
Prepare typescript/return-await with error-handling-correctness-only: await
returns whose catch or finally was meant to cover them, and suppress the eight
sites where the catch must not re-handle the returned promise.
* chore(lint): enable return-await (error-handling-correctness-only); exempt secondary-scan directives in the changed gate
* refactor(mobile): move file preview discard modal into its own module
Keeps MobileFilePreviewScreen under the 400-line limit after merging main.
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Co-authored-by: m4air <m4air@m4airs-MacBook-Air.local>