fix(mobile): show stopped cloud runs as stopped, not failed (port #3697)

[Gilbert09]

Problem

The mobile app already lets you stop a running cloud task, but a deliberately-stopped run (backend status cancelled) was being treated as a failure. The end-of-run banner showed a red "Run failed" with a Retry button — as if something had gone wrong — even though the user chose to stop it.

Why: this ports the desktop fix in #3697 ("Show stopped cloud tasks as completed") to mobile, where users hit this regularly since the stop-run action shipped.

Changes

• mapTerminalStatus now maps cancelled to a distinct stopped outcome instead of collapsing it into failed.
• The terminal banner reads "Run stopped" with neutral/success styling and offers Continue (not Retry) for a stopped run. Failed and completed runs are unchanged.
• Introduced a shared TerminalStatus type in types.ts (used by the store, session-activity helper, and the banner) to replace the inline union that was being repeated.
• Extracted the banner into a TerminalStatusBanner component so its wording is unit-testable in isolation.
• The cloud task-list icon path is intentionally left alone — it short-circuits every cloud task to the chat icon before it inspects status, so a stopped run already renders sensibly.

How did you test this?

• New parameterised test for mapTerminalStatus covering completed / failed / cancelled / in-flight / nullish inputs.
• New TerminalStatusBanner tests covering the banner wording and action for each terminal outcome, and that a stopped run is never labelled failed.
• Ran the mobile suite (taskSessionStore, TerminalStatusBanner, TaskStatusIcon, sessionActivity — 41 tests passing), tsc (no new errors in touched files), and biome check (clean).

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

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Created with PostHog Code

[trunk-io]

😎 Merged successfully - details.

[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit 65baa10.}

[github-actions]

Contained mobile UI fix that maps a backend "cancelled" status to a distinct "stopped" outcome instead of "failed"; diff matches the description, includes new unit tests, and touches no risky territory (no auth, billing, migrations, deps, or CI).

• Author wrote 2% of the modified lines and has 23 merged PRs in these paths (familiarity MODERATE).

Gate mechanics and policy version

Gate		Result
prerequisites	✓	all clear
deny-list	✓	no deny categories matched
size	✓	130L, 5F substantive, 213L/7F incl. docs/generated/snapshots — within ceiling
tier	✓	T1-agent / T1c-medium (213L, 7F, single-area, fix)
stamphog 2.0.0b3		.stamphog/policy.yml @ f057f43 · reviewed head 65baa10