Rework Tasks tab: Chains section, checklist modal, project visibility

The flat Tasks-tab atom list was silently dumping every chain step
(locked and unlocked) and dormant bucket-pool items in as ordinary
undated cards, with no chain/project context and no protection against
completing a locked step out of order.

- CompleteNativeTask now rejects completing a locked chain task
  (ErrChainTaskLocked), mapped to 400 in both the widget and web
  complete-atom handlers.
- Chain tasks and dormant bucket items are excluded from the flat atom
  list; a new "Chains" section shows one card per active/paused chain
  with the current step and N/M progress.
- New chain checklist modal (GET /chains/{id}) lists every position in
  order with pause/resume/abandon -- the web view originally deferred
  as Android-only.
- Fixed a real bug this surfaced: resuming a paused chain only flipped
  the status flag, never unlocking the deferred successor, so a chain
  paused right after a completion stayed stuck forever. SetChainStatus
  now catches up the deferred advancement on resume, idempotently.
- Atom cards gained a project-name chip for general visibility.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EZ7ikw2ukGJFTHE3bJS7zL

1 files changed, 1 insertions, 0 deletions

diff --git a/.agent/worklog.md b/.agent/worklog.md
index 932cad8..34f6cb4 100644
--- a/.agent/worklog.md
+++ b/.agent/worklog.md
@@ -4,6 +4,7 @@
 Cleaned Backlog
 
 ## Recently Completed
+- **Tasks tab rework: Chains section, chain checklist modal, chain-completion lock guard, project-name visibility** — the flat Tasks-tab atom list was silently dumping every chain step (locked and unlocked) and dormant bucket-pool items into the grid as ordinary undated cards, with no chain/project context and, worse, a raw Complete checkbox that `CompleteNativeTask` didn't actually guard against for locked steps (would have corrupted the WIP-1 invariant if clicked). Fixed: `CompleteNativeTask` now returns `ErrChainTaskLocked` for a locked chain task (mapped to 400 in both the widget and web complete-atom handlers); chain tasks (locked or unlocked) and dormant bucket items are excluded from the flat atom list entirely; a new "Chains" section on the Tasks tab shows one card per active/paused chain (`GetChains`, `BuildChainSummaries`) with the current step, N/M progress, and a click-through to a new modal (`GET /chains/{id}`, `chain-detail.html`) listing every position in order (locked/unlocked/completed) with pause/resume/abandon buttons -- the web checklist view originally deferred as Android-only. Along the way, found and fixed a real bug this surfaced: resuming a paused chain only flipped the status flag, never actually unlocking the deferred successor, so a chain paused right after a completion would stay stuck forever -- `SetChainStatus` now catches up the deferred advancement on resume, idempotently (no due-date reset if nothing was actually stuck). Regular atom cards also gained a project-name chip for general visibility. Fully covered by store+handler tests (`go test ./...` green). Not yet deployed.
 - **Linear task chains + recurring maintenance buckets** — implemented the last two items from `[[doot-future-task-scheduling-ideas]]` (items 1 and 2, budgets/availability and labels/projects, turned out to already be shipped -- their spec status headers and the budgets plan's checkboxes had just never been updated to say so; corrected both). Chains: `task_chains` table + `chain_id`/`chain_position`/`chain_unlocked` on `native_tasks` (migration 026), WIP-limit-1 sequencing wired into `CompleteNativeTask`'s existing recurrence-hook pattern, locked tasks excluded from all date-based queries, 5 new `/api/widget/chains*` endpoints, a position badge ("N/M") on web timeline rows and the Android widget row. Buckets: `maintenance_buckets` table + `bucket_id`/`bucket_state`/`bucket_last_active_at` on `native_tasks` (migration 027), staleness-then-priority selection scoring, a new `RunBucketCycleCheck` scheduler loop mirroring `RunRecurrenceCheck`, 5 new endpoints including the distinct Defer action (returns to pool without crediting completion, unlike Complete), a Defer button on both web timeline rows and the Android widget row. Both fully covered by store+handler tests (`go test ./...` green). Deferred (backend/API exists, UI doesn't): a dedicated Android chain-checklist screen, and bucket-management create/add-item screens on web or Android -- both explicitly out of scope in their specs' own interviews. Not yet deployed or built into the Android APK.
 - **Task labels and projects** — doot-native tasks get a lightweight Projects concept (name + user-assignable color, exactly one per task) and the previously-dormant `Labels` field is finally wired up end-to-end (free-text tags, each assigned a deterministic color on first use). Both are inherited automatically across recurring task series, just like content/description already are. Editable in the task-detail popup (project picker with inline "create new" + color swatches, a label chip editor); the widget's time-grid rows show a small project-color accent. Trello/Google Tasks cards are unaffected. Built via a 9-task subagent-driven plan, all tasks reviewed clean; deployed server + widget APK.
 - **Widget polish: task/event font parity, instant task completion, recurrence dialog redesign** — TaskRow's title color (a flat hardcoded gray) now matches EventBlock's (Color.White, dimmed only when past) at the same size/weight — the color gap was reading as a font mismatch. CompleteTaskAction now optimistically removes the completed item from the cached list and re-renders immediately (matching RefreshTaskAction's existing pattern) instead of waiting for the full complete->fetch->render round trip. Redesigned RecurrenceEditDialog: the 4 frequency chips and 7 weekday chips were each in a non-wrapping Row (overflowing/cut off on real phone widths) — now FlowRow-based so they wrap; single-letter weekday chips; a narrow fixed-width interval field with a correctly-pluralized unit label (was "Every N dailys"); muted section labels for visual structure. Deployed new APK.