Notify when my own Bots finish or fail a turn, with one Notifications switch - #470

ThinkFlowLab#491)

Part of ThinkFlowLab#471 (first slice, owner decision 2026-10-20 option a). ThinkFlowLab#471
also lists items the owner deferred (board view, tool-call counts,
first-run guide, team views waiting for ThinkFlowLab#51/ThinkFlowLab#149/ThinkFlowLab#55/ThinkFlowLab#57, inbox-side
task actions), so this PR does not close it.

**What**
- **Failed turns in the Agent inbox.** *Needs you* gets a **Failed**
card for a turn of my own Bot that failed, read from `work.ended`, the
same ended-turn entries the finish/fail notifications use (ThinkFlowLab#353, PR
ThinkFlowLab#470); no second event source. A card shows while that failure is the
latest ended turn in its place (a Bot's own chat or one group), younger
than 7 days, and the Bot is not running or waiting for an approval
there. A later finished turn clears it, and that chat is then not also
in *Done*. Title: the chat's last line (*The last turn did not finish*
without the Session list); reason: the failure text. **Open** only.
- **Latest activity row.** Each card may carry one more line, `Latest:
…` (full text on hover): a task's newest note, else what its Bot runs
there now (running turns and tasks only), else the chat's last line.
Left out when it only repeats the title or reason.
- Host (`turns.js`): past the last 20 ended turns, a place's latest turn
is kept while it is a failure younger than 7 days (at most 50), so busy
Bots elsewhere do not push an unresolved failure out of the inbox.
Notifications are unaffected (they already skip entries they told or
that predate the window).
- Out of scope (deferred by the owner): board view, tool-call counts,
team views.

**Test**
- `core/test/inbox.test.js`: failed-turn cards (own Bots only,
latest-in-place, cleared by running/waiting/a later finished turn, 7
days, badge count, Open only) and the latest-activity row (sources, no
repeats, rendering). `core/test/approval-notices.test.js`: the host
keeps a still-latest failure past the last 20 and drops it once a
finished turn follows.
- `ARCH_DOCS_BASE=origin/main TZ=UTC npm run verify`: pass (core 1080,
social 296, tree 80, timeline 83, scripts 93, interop 37, live-e2e 16; 0
failures; plugin lint ok; patches check ok; arch-docs OK).
- Not run: live DSH bench / the owner's Mac instances (no visual check
in a running shell).

Docs: `docs/subsystems/core-client.md` (Agent inbox),
`docs/subsystems/core-host.md` (`endedView`). Changelog:
`changelog.d/471-inbox-failed-turns.added.md`.

Risk tier: T2 (estimate; the controller sets the label)

Co-authored-by: Birfy <15378933+Birfy@users.noreply.github.com>

… one notification per chat (ThinkFlowLab#492)

Fixes ThinkFlowLab#469 (first slice, owner decision 2026-10-20 option a). Builds on
ThinkFlowLab#353's notifications (ThinkFlowLab#470). Quiet hours, mute and an in-app list stay
for later; friends'/team notifications wait for ThinkFlowLab#51.

**What**
- **Waiting too long:** an approval still waiting 15 min after it
started (or after the window opened, if it started earlier) gets one
more notification: `Coder has waited 15 min for your approval`. A client
timer is set for the next due approval and cleared with the effect; a
decided approval gets none.
- **Per-kind switches:** Settings → General → Notifications keeps the
main switch and adds **Waiting for approval** (covers the reminder),
**Finished** and **Failed** (`prefs.notify`, on unless `false`; disabled
while the main switch is off). `set-prefs` takes `notify: { approval |
finished | failed: boolean }`, keeps only the off ones.
- **One per chat:** every notification of a chat or group shares the tag
`ds-bot-<chat id>`, so a newer one replaces the older, and the body
counts the updates (`3 updates`) since the chat was last on screen or
its notification clicked. Several events of one chat in one pass become
one notification (the newest).
- Unchanged: never asks for permission, nothing from before the window
opened, a click only opens the chat (no buttons, never approves or
sends).

**Test**
- New tests in `core/test/approval-notices.test.js` (reminder timing and
cleanup, reminder for pre-window approvals, per-kind switches, per-chat
collapse and count reset, Settings rows) and `install.test.js`
(`set-prefs notify`).
- `ARCH_DOCS_BASE=origin/main TZ=UTC npm run verify`: pass (core 1082,
social 296, tree 80, timeline 83, scripts 93, interop 37, live-e2e 16; 0
failures). `changelog.mjs check`: ok.
- Not run: live Mac instances, real OS notifications in a desktop build.

Risk tier: T2 (estimate; the controller sets the label)

Co-authored-by: Birfy <15378933+Birfy@users.noreply.github.com>