Clean up sync code before integrating pixels

[MiSikora]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1216103556496795/task/1217108453800380?focus=true
Tech Design URL (if applicable): N/A
API Proposals URL(s) (if applicable): N/A

Description

Pure refactor of the simplified Sync v2 setup flows. It renames types, parameters, and activity launchers so their names describe what they actually represent, and tidies up input creation. There are no behavior changes.

Sync entry point:

• The OriginalFlow enum is renamed to SyncEntryPoint and moved to its own file, because it identifies which entry point the setup started from rather than an "original flow".
• Its values now describe the account action: SYNC_THIS_DEVICE becomes SYNC_NEW_ACCOUNT (create and back up a new account) and SYNC_WITH_ANOTHER becomes ADD_DEVICE (add a device to an existing account). RECOVER_SYNCED_DATA is unchanged.

Process sync code screen:

• ExchangeSyncCodeActivity and its contract, view model, layout, and animation are renamed to ProcessSyncCode*. "Exchange" was confusing since Sync also has exchange codes, whereas this part of the flow is about processing an input code, so "Process" is clearer.

Parameters and launchers:

• syncUrl is renamed to syncCode, because the value is not always a URL.
• source is renamed to launchSource to disambiguate it from other "source" concepts.
• The activity launchers in SyncActivity are renamed to match what they launch, for example syncThisDeviceLauncher becomes backUpNewAccountLauncher and exchangeSyncCodeLauncher becomes processSyncCodeLauncher.
• Contract input parameters are reordered so syncCode sits next to syncEntryPoint and launchSource comes last, launcher input creation is written consistently, and an unused import is removed.

Steps to test this PR

N/A

UI changes

N/A

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Note

Low Risk
Naming and structural refactor across sync UI with tests updated; no auth or sync protocol logic changes described beyond renames.

Overview
Refactors simplified Sync v2 setup naming so entry points, parameters, and screens read clearly before pixel work—no intended behavior changes.

Entry point model: OriginalFlow becomes SyncEntryPoint in its own file, with values SYNC_NEW_ACCOUNT, ADD_DEVICE, and RECOVER_SYNCED_DATA. Auto-restore pixel source mapping moves to SyncEntryPoint.toAutoRestorePixelSource() (replacing duplicated helpers).

Process sync code screen: ExchangeSyncCodeActivity / contract / VM / layout / animation are renamed to ProcessSyncCode*, and intent extras use syncCode instead of syncUrl.

Parameters & launchers: source → launchSource, originalFlow → syncEntryPoint across v2 activities and contracts; v2 SyncActivity renames launchers (e.g. backUpNewAccountLauncher, processSyncCodeLauncher) and aligns contract Input field order.

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[MiSikora]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Clean up sync code before integrating pixels #9386 👈 (View in Graphite)
• Avoid signing out of a device when renaming it #9374
• Handle simplified sync deep linking #9373
• Handle restore on reinstall sync scenario #9368
• Simplified sync UI updates #9363
• Handle v1 exchange sync codes #9362
• Handle sync recovery basic scenario #9356
• Add syncing with another device logic and navigation #9343
• Add generic handling of v1 sync errors #9337
• Add sync with another device UI #9334
• Detect scanned QR sync codes #9333
• Handle sync code pasting #9332
• Refactor simplified sync class names #9329
• Handle sync logic on the displayed QR code page #9328
• Display sync QR code in simplified sync #9321
• Make remove device dialog destructive #9317
• Mitigate sync settings UI race condtions #9316
• develop

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