P2R-02 follow-up: clickable rows on Sources/Schedules + cron-preset tooltips

Aligns Sources and Schedules tab rows with the dashboard's row-click
UX: whole-row click navigates to the row's edit page (mirroring
.host-row.clickable). Drops the redundant Edit buttons; Run-now and
Delete remain in .row-action cells that sit above the row-link
overlay via z-index.

Schedule edit form's cron preset chips now carry human-readable
title= tooltips ("Every day at 03:00", "Every Sunday at 03:00", etc).

tasks.md gets a binding row-design rule covering all current and
future list-row templates, and the P2R-02 entry is split into the
six slices already agreed with the operator (slices 1–3 marked
done, 4 next).

tasks.md

@@ -142,16 +142,27 @@ Sizes: **S** = under a day, **M** = 1–3 days, **L** = 3–7 days.
   - **Auto-init at enrolment**: server dispatches `restic init` on first WS connect (was P2-old "Init repo" button — now invisible to the operator). On success: emit a normal job row with `kind=init` so the audit trail still shows it. On `init` returning "config file already exists" (e.g. re-enrolment against an existing repo): treat as soft success per existing restic-wrapper behaviour.
   - **Tests**: rewrite the deleted `schedules_test.go` and `schedule_push_test.go` against new endpoints; new `source_groups_test.go`, `repo_maintenance_test.go`, `auto_init_test.go`. End-to-end: enrol → server pushes creds → server dispatches init → agent runs it → schedule reconcile fires → operator hits per-source-group Run-now → backup runs → snapshots refresh.
 
-### P2 redesign — Phase 4 (UI rewire, against v4 wireframes) — TODO
+### P2 redesign — Phase 4 (UI rewire, against v4 wireframes) — IN PROGRESS
+
+> **Row-design rule (binding for every list-row template in this app, current and future):**
+> Whole-row click navigates to the row's primary detail/edit page —
+> mirror `.host-row.clickable` on the dashboard
+> (`partials/host_row.html`): an absolute-positioned `.row-link`
+> overlay with `text-indent: -9999px` covers the row, action buttons
+> live in `.row-action` cells that sit above via z-index. **Do not
+> add an explicit "Edit" button** when the row is clickable — it
+> duplicates the affordance and dilutes the click target. Action
+> cells are reserved for verbs that aren't "open this row" (Run-now,
+> Delete, Pause, etc).
 
 - [ ] **P2R-02** (L) UI templates rebuilt against the new model:
-  - `/hosts/{id}/sources` — list of source groups with per-row meta (includes/excludes count, retention summary via `RetentionPolicy.Summary()`, usage = which schedules reference this group, snapshot count for `tag = group.name`). Run-now / Edit / Delete actions per row.
-  - `/hosts/{id}/sources/{gid}/edit` (and `/sources/new`) — name (= snapshot tag), includes/excludes textareas, retention as a 3×2 keep-* grid, retry-on-offline, inline conflict banner above retention when granularity ↔ cadence mismatch detected (uses `SourceGroup.conflict_dimension` cache).
-  - `/hosts/{id}/schedules` — slim list (status / cron / source-tags / actions) plus new-schedule form (cron with quick-pick chips, source-group multi-select via clickable check pickers, enabled toggle).
-  - `/hosts/{id}/repo` — connection (URL/user/password — pre-filled from `GET /api/hosts/{id}/repo-credentials` redacted view; cert pin), bandwidth caps (host-wide), maintenance rows (forget/prune/check cadence + check subset %), danger-zone re-init.
-  - **Re-enable the four host-detail sub-tabs** (Snapshots is already live; Schedules / Sources / Repo become real links again; Settings stays inert until later). Drop the stop-gap inert-div hack from P2R-00.4.
-  - **Per-source-group Run-now buttons** replace today's per-host `Run backup now` buttons (right-rail + dashboard row + empty-snapshots state). Dashboard row's Run-now becomes either "Run all groups" (if exactly one schedule covers all groups) or "Open →" (multi-group hosts).
-  - Header "version N · agent in sync / agent at vM" indicator preserved (still backed by `host_schedule_version` + `applied_schedule_version`).
+  - **Slice 1 ✅** Sub-tab navigation skeleton — extract header/vitals/sub-tabs into a `host_chrome` partial; Sources / Schedules / Repo become real `<a>` links; placeholder pages share the chrome; version indicator restored. (commit `a535822`)
+  - **Slice 2 ✅** Sources tab — `/hosts/{id}/sources` list with per-row meta + clickable rows + per-group Run-now/Delete; `/sources/new` and `/sources/{gid}/edit` form (name, includes/excludes, 3×2 keep-* grid, retry-on-offline, inline conflict banner from `ConflictDimension` cache); validation re-renders form with input intact; refuses to delete a host's last source group. (commits `0ed9c3d`, `dede74f`)
+  - **Slice 3 ✅** Schedules tab — `/hosts/{id}/schedules` slim list (status / cron / source-tags / actions, clickable rows) plus `/schedules/new` and `/schedules/{sid}/edit` form (cron with five quick-pick chips that have human-readable tooltips, source-group multi-pick as styled check cards, enabled toggle); per-schedule Run-now reuses `dispatchScheduledJob`. (commit `67ca769` + clickable-row follow-up)
+  - **Slice 4 (next)** `/hosts/{id}/repo` — connection (URL/user/password — pre-filled from `GET /api/hosts/{id}/repo-credentials` redacted view; cert pin), bandwidth caps (host-wide; new `PUT /api/hosts/{id}/bandwidth`), maintenance rows (forget/prune/check cadence + check subset %), danger-zone re-init.
+  - **Slice 5** Per-source-group Run-now wiring on dashboard row + empty-snapshots state. Dashboard row's Run-now becomes either "Run all groups" (if exactly one schedule covers all groups) or "Open →" (multi-group hosts).
+  - **Slice 6** Playwright sweep — login → walk new tabs → create source group → create schedule → run-now → confirm dispatch.
+  - Header "version N · agent in sync / agent at vM" indicator preserved across all tabs (backed by `host_schedule_version` + `applied_schedule_version`).
   - Form validation re-renders with the operator's typed input intact (mirror P2-04's behaviour). Each save fires `pushScheduleSetAsync` so an online agent re-arms within seconds.
 
 ### P2 redesign — Phase 5 (server-side maintenance ticker) — TODO