[Fix] Recover repository selection when editing an environment

[roomote-roomote]

​Opened on behalf of @daniel-lxs. Follow up by mentioning @roomote-roomote, in the web UI, or in Telegram.

Editing an existing environment now distinguishes a failed initial repository read from an empty list. A compact, announced error and Retry action replace the misleading missing-repository hint, and Start Agent stays disabled until the initial read succeeds. Cached repository choices and direct YAML editing remain available.

Retry restores repository choices without losing the typed change request. The recovery message uses the existing button styles and fits inline within the editor card on desktop and mobile.

Validation on the updated head covered current-develop reproduction, an actual failed repository query, keyboard Retry, recovered selections, retained draft text, cached choices during a background failure, and successful task creation with the selected repository and request in the persisted payload. A successfully empty repository list still permits repository-free editing. All 17 focused create/edit tests, lint, typechecks, formatting, and Knip passed.

The controlled failure was confined to a disposable local database and exercised the real application query and recovery path. Desktop and 390×844 mobile layouts were inspected. Task creation was verified through the queued state; worker execution and a live source-control-provider outage were outside this UI change's scope.

Screenshots from the original revision

These captures show the recovery flow at c0b3629e, before the compact error-row refinement in 0102a923d. The current error state uses an inline message and Retry button instead of the larger bordered panel shown below.

[roomote-community]

No new code issues found. See task

_{Reviewed 0102a92}

[daniel-lxs]

Verified the initial repository-load failure against current develop and recovery on this exact head. Keyboard Retry restores repository choices while preserving typed instructions; cached selections survive a failed background read. Successful task creation persists the selected repository and request. Desktop/mobile error layout, valid empty-list behavior, direct YAML access, 17 focused tests, lint, typechecks, formatting, and Knip passed.