A capability stays maintainable only when the team can explain every state, retry, and piece of residual data—not merely show one successful run. The URL expresses intent and persistence describes possible work; neither is current fact. Validate route, then tasks and connection, before choosing resume, end, or reauthorization.
Frontend architecture is about state ownership, repeatable events, invalidation of stale async work, and cleanup after unmount—not the shape of the source directory.
Questions the design must answer
This capability crosses clients, networks, and servers, so a local optimization can create a system failure. Decisions must constrain both endpoints, persisted truth, and operating budgets together.
- Keep only feature tabs and non-sensitive filters in public URLs; exclude codes, tokens, and filenames.
- A coordinator reconciles task and peer state; route components do not independently reconnect.
- Invalid or unauthorized deep links fall back with an explanation instead of blank screens or loops.
Refresh restoration is reconciliation, not repainting localStorage. URL, permission, terminal state, and peer facts must agree before work continues.
Edge cases are part of the feature
Prioritize faults that silently preserve false facts: the interface looks recovered while a queue, permission, or counter has diverged. The defect often appears only on the next action.
- Route watchers and recovery stores navigate simultaneously, causing tab flicker.
- A historical URL contains a revoked device ID and refresh reconnects to it.
- A completed task remains persisted and its deep link shows active transfer.
Prove that it works with evidence
Write the expected state trace before injecting faults. At every phase, reconcile user-visible outcome, both protocol endpoints, persistent records, and resource counts to prove the loop.
- Refresh every feature tab and task phase and verify final route, focus, and connection behavior.
- Open expired, revoked, and tampered links without leaking values into logs or canonical metadata.
- Race route restoration with peer presence and assert one coordination flow starts.
The release standard is practical: the normal path is fast, abnormal paths converge, recovery never overrides an explicit user decision, and operators can diagnose faults from limited, privacy-safe evidence.