merge compact duration display

# Conflicts:
#	.agents/notes/implemented/feature/2026-07-27-web-subagent-conversations.i18n.yaml
#	.agents/notes/implemented/feature/2026-07-27-web-subagent-conversations.md
#	.agents/notes/implemented/feature/2026-07-27-web-subagent-conversations.zh.md
#	apps/web/tests/snapshots/subagent-conversation/tree.expected.md
#	packages/client/ui-subagent/README.i18n.yaml
#	packages/client/ui-subagent/README.md
#	packages/client/ui-subagent/README.zh.md
#	packages/client/ui-subagent/src/client/SubagentCatalogAction.tsx
#	packages/client/ui-subagent/tests/conversation-ui.spec.tsx

.agents/notes/implemented/feature/2026-07-27-web-subagent-conversations.md

@@ -33,7 +33,7 @@ The Figma [subagent list](https://www.figma.com/design/jRBBK7zBgcszdVWQ0Fh5J8/Ha
 | The session header opens a compact child list. | The trigger aggregates the complete subagent-only descendant lineage; the tree shows every direct catalog entry in service order, including disabled diagnostics. |
 | Selecting a row reuses the conversation UI. | Addressed history never activates the child; only a continuable row with a live parent retains the ordinary composer. |
 | Nested agents expand progressively. | Each row carries a one-level `hasChildren` snapshot; disclosure reserves known direct-descendant rows immediately, then loads only that row's direct catalog and retains its own parent address. |
-| Rows show labels, state, usage, and active duration without duplicating sidebar rows. | Mode and `running`/`inactive` activity are textual as well as visual; optional title, durable token usage, and exact active-turn duration come from the list's retained projection values. `SessionHeader.origin` removes duplicate navigation rows but grants no capability. |
+| Rows show labels, state, usage, and active duration without duplicating sidebar rows. | Mode and `running`/`inactive` activity are textual as well as visual; optional title, durable token usage, and active-turn duration come from the list's retained projection values. Compact duration loses smaller units above one day, while hover and accessible naming retain exact whole seconds. `SessionHeader.origin` removes duplicate navigation rows but grants no capability. |
 
 ## Product contract
 
@@ -41,7 +41,7 @@ The header action is absent only when a complete empty direct-catalog response a
 
 `running` means the exact child Agent driver is draining work at the Host sampling boundary; `inactive` means that driver is idle or absent. The UI does not translate either value into success, failure, cancellation, completeness, or resumability. `subagent.list` supplies the current driver-status baseline, `host/session-status` updates known activity in place, request-local replay prevents an older in-flight list response from overwriting a newer transition, and `host/session-removed` returns a known row to `inactive`; reconnect reads a fresh baseline. A `host/session-added` frame for a direct subagent immediately flips any loaded parent row to `hasChildren: true`, and that positive hint survives an older in-flight catalog response; membership, labels, mode, diagnostics, and the authoritative snapshot still require a debounced `subagent.list` refresh while the affected branch is open. A prompt response remains delivery-time authority.
 
-Healthy rows reuse the standard session projections retained in the list mirror. The token figure sums the four disjoint `tokenUsage` buckets across the durable log. `subagentTiming` resets at every descriptor so an inherited fork seed cannot enter the child's total, accumulates completed `turn/start` → `turn/end` spans, and carries same-cut `active.since` and `active.through` bounds for an open turn. Existing session events advance `active.through` while that turn remains open; the menu adds no separate timer or log read, formats whole seconds, and advances its local clock only while a known descendant is running. An inactive row bounds an interrupted open turn with `active.through`, so a stale projection never borrows newer session metadata and reopening the menu never restarts completed work. Neither metric implies a durable outcome.
+Healthy rows reuse the standard session projections retained in the list mirror. The token figure sums the four disjoint `tokenUsage` buckets across the durable log. `subagentTiming` resets at every descriptor so an inherited fork seed cannot enter the child's total, accumulates completed `turn/start` → `turn/end` spans, and carries same-cut `active.since` and `active.through` bounds for an open turn. Existing session events advance `active.through` while that turn remains open; the menu adds no separate timer or log read and advances its local clock only while a known descendant is running. Below one day it formats whole seconds; longer visual values retain at most two adjacent units, using approximate 30-day months and 365-day years, while hover and accessible naming preserve the exact day/hour/minute/second duration. An inactive row bounds an interrupted open turn with `active.through`, so a stale projection never borrows newer session metadata and reopening the menu never restarts completed work. Neither metric implies a durable outcome.
 
 Selecting a row records its exact address before opening the resident client `Session`. History pagination, event folding, tool render intents, titles, and live mux reconciliation reuse the ordinary conversation machinery. Breadcrumbs use catalog labels, follow parent links only through `origin: 'subagent'` rows, include the first ordinary owner, and keep ordinary forks single-level. Forking an addressed subagent creates an ordinary fork with direct source lineage and attaches it to the nearest workspace-owning ancestor. The catalog is an ARIA tree with lazy ArrowRight/ArrowLeft disclosure, linear ArrowUp/ArrowDown navigation, Home/End, Escape, and focus restoration.
 
@@ -104,8 +104,8 @@ The shipped Web composition mounts SQLite session query beside JSONL persistence
 - Host protocol tests pin schemas including required boolean expandability, id echoing, mode verification, non-activating history, exact-parent enforcement, FIFO admission receipts, cancellation, and sanitized failure mapping.
 - Generic Host tests pin attached and cold history and forks without Agent publication, cold projection folding, descriptor/origin/runtime-owner denial, explicit-id adoption denial, and the direct queue-control fence.
 - Client object tests pin retained and restored addresses, one-shot read-only rejection, history routing, continuable prompt routing, no addressed cancellation, suppression of Agent-bound model controls, live activity flips including in-flight response replay and detach fallback, subagent-parent expandability flips, and membership refresh.
-- jsdom tests pin the aggregate descendant count and activity, token totals, second-precision running and frozen inactive durations, the summary-backed root action across absent and stale-empty catalogs, known loading-row shape, mixed-mode rows, pre-click leaf disclosure, diagnostics, lazy descendant disclosure, direct-parent addresses, keyboard behavior, and both read-only reasons.
-- The keyless assembled Web snapshot contains an inactive continuable child with durable usage, an inactive one-shot sibling, and a persisted grandchild; it pins the three-descendant trigger across a stale empty catalog response, usage and timing rows, and aggregate running transition, expands without activation, opens persisted history, admits a human FIFO follow-up, reconciles child mux events, and proves one-shot history remains read-only.
+- jsdom tests pin the aggregate descendant count and activity, token totals, second-precision running and frozen inactive durations, adaptive long-duration units with exact accessible text, the summary-backed root action across absent and stale-empty catalogs, known loading-row shape, mixed-mode rows, pre-click leaf disclosure, diagnostics, lazy descendant disclosure, direct-parent addresses, keyboard behavior, and both read-only reasons.
+- The keyless assembled Web snapshot contains an inactive continuable child with durable usage, an inactive one-shot sibling with a deterministic long duration, and a persisted grandchild; it pins the three-descendant trigger across a stale empty catalog response, usage and timing rows, adaptive long-duration presentation, and aggregate running transition, expands without activation, opens persisted history, admits a human FIFO follow-up, reconciles child mux events, and proves one-shot history remains read-only.
 - Navigation tests pin subagent-only breadcrumbs, workspace placement for forks created from subagents, and `origin: 'subagent'` sidebar filtering without hiding ordinary forks.
 
 ## Consequences