feat(app): permission and question docks don't say which subagent asked #124

Finding

Since PR #60 (merged as 1585d2b), the root session's docks show pending permission requests and questions from subagents at any depth, including ones raised before the app loaded. Neither dock says which session asked.

• The permission dock's header is "Permission required".
• The question dock's header is "Question", or "Question n of m".

That is the same whether the request came from the viewed session or from a grandchild. With several subagents running, the user can't tell which one wants to run the command or is asking.

Evidence (main 5214f4d)

• packages/app/src/session/requests/model.ts:26-36 loads permissions and forms for every session in the viewed tree (sessionTreeIDs(data.session.list(), id)).
• packages/app/src/session/requests/session-permission-dock.tsx:25-34: the header is the warning icon and language.t("notification.permission.title") ("Permission required", packages/app/src/runtime/i18n/en.ts:498). The request's sessionID is never shown.
• packages/app/src/session/requests/session-question-dock.tsx: the header shows summary() (546-556), which is session.question.title ("Question", en.ts:570) or session.question.progress (127-132).
• Both docks are mounted in packages/app/src/session/composer/session-composer-region.tsx:43-51.

OpenChamber labels a docked request from a descendant "From subagent" (chat.questionCard.fromSubagent, developing-today/openchamber packages/ui/src/lib/i18n/messages/en.ts:2493).

The TUI's permission prompt header has the same gap: "Permission required" plus the tool's title (packages/tui/src/routes/session/permission.tsx:200-214). I haven't checked the rest of the TUI root view for attribution. This issue covers the app; the TUI can be fixed alongside it or tracked separately.

Acceptance criteria

• A dock showing a request from a session other than the viewed one names that session, for example "From ". The title comes from data.session.get(request.sessionID), with a fallback when it isn't loaded.
• A request from the viewed session itself looks as it does today.
• New copy is an i18n key in packages/app/src/runtime/i18n/en.ts only, per packages/app/AGENTS.md:30-31; other locales fall back to English.
• An e2e test asserts the label for a subagent's request and its absence for the viewed session's own. "answers a subagent's permission from the root session after a fresh load" (packages/app/e2e/regression/session-request-docks.spec.ts:212) already sets up the first case.