fix(types): align TS UserPreferences with Rust update_channel

[appergb]

User description

Summary

Rust types.rs declares pub update_channel: UpdateChannel on UserPreferences, but the TS interface in src/lib/types.ts and mockSettings in src/lib/ipc.ts both omitted it. setSettings() round-trips were lossless only because Rust's serde(default) refilled the field, so today's behavior is unaffected — but TS consumers that destructure UserPreferences silently miss the field, and the type was lying about what the backend serializes.

Changes

• Move UpdateChannel type from ipc.ts to types.ts (avoids ipc <-> types circular import).
• ipc.ts re-exports UpdateChannel for backward compat — SettingsModal.tsx and any other module still imports from ipc.ts unchanged.
• Add updateChannel: UpdateChannel to UserPreferences interface.
• Add updateChannel: 'stable' to mockSettings and to the stylePrefs.test.ts fixture (otherwise tsc fails).

Audit linkage

Audit ID 2.2.1 of the 2026-05-10 audit set (CONFIRMED). See docs/audit-2026-05-10-validated.md (local, not in repo) for the full validation context.

Test plan

• npx tsc --noEmit clean (was failing on stylePrefs.test.ts for missing field — now fixed)
• npm run build — to be verified in CI
• Settings → About → Beta channel toggle still reads/writes via getUpdateChannel/setUpdateChannel IPC (unchanged)

Awaiting manual verification: this is a TS-only change; Rust round-trip behavior is identical.

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PR Type

Bug fix, Tests

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Description

• Add updateChannel field to TS UserPreferences to match Rust backend

• Move UpdateChannel type from ipc.ts to types.ts to avoid circular imports

• Update mockSettings and test fixture with new required field

• Re-export UpdateChannel from ipc.ts for backward compatibility

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Diagram Walkthrough

flowchart LR
  A["Rust UserPreferences includes update_channel: UpdateChannel"] -- "missing in TypeScript" --> B["TS types.ts now defines UpdateChannel and adds updateChannel to UserPreferences"]
  B --> C["ipc.ts imports and re-exports UpdateChannel, adds field to mockSettings"]
  B --> D["stylePrefs.test.ts adds field to test fixture"]
  C --> E["SettingsModal and other imports remain unchanged"]

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File Walkthrough

	Relevant files
Bug fix	types.ts Define UpdateChannel type and add updateChannel to UserPreferences openless-all/app/src/lib/types.ts Added UpdateChannel type definition (moved from ipc.ts) Added updateChannel: UpdateChannel property to UserPreferences interface +7/-0      ipc.ts Refactor UpdateChannel import and update mockSettings        openless-all/app/src/lib/ipc.ts Imported UpdateChannel from ./types instead of defining inline Re-exported UpdateChannel for backward compatibility Added updateChannel: 'stable' to mockSettings fixture Removed old inline type definition and updated comments +5/-1
Tests	stylePrefs.test.ts Add updateChannel to test fixture                                                openless-all/app/src/lib/stylePrefs.test.ts Added updateChannel: 'stable' to previousPrefs test fixture to match new interface requirement +1/-0

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[github-actions]

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