Feature: Update task (title/deadline) + UI edit modal + quick deadline

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What we're building

Phase 2 of the MCP+UI proposal (v2.10.2): give tasks a real edit path. Title and deadline previously had NO edit capability (set only at creation); project/labels/completion each had a sub-resource PATCH. This adds title+deadline editing across all three surfaces plus a full-edit modal and a quick-deadline popover.

Scope

In scope:

• Backend: new PATCH /api/tasks/{id} (root) - true partial update of title + deadline via JsonElement present-key detection. Omit=keep, null=clear, value=set. Empty title -> 400, malformed date -> 400.
• MCP: new update_task(id, { title?, deadline? }) tool + api.updateTask. Sends only provided keys; deadline: null clears. Tool count 15 -> 16.
• Web UI: EditTaskModal (full edit: title, deadline, project, labels) - title+deadline via new PATCH, project/labels via existing endpoints, only changed fields fire, then getTask for the canonical result.
• Web UI: DeadlinePopover on the deadline pill - presets Today / Tomorrow / This weekend / Next week / None(clear).

Plan

docs/plans/_archive/P59-update-task-and-edit-modal.md

Outcome

What was built:

• PATCH /api/tasks/{id} with JsonElement present-key detection (omit=keep, null=clear, value=set); 400 on empty title / bad date; 404 on unknown id.
• MCP update_task tool + api.updateTask (relies on JSON.stringify omitting undefined / keeping null - no read-modify-write).
• EditTaskModal (diff-and-fan-out save across PATCH + assign-project + set-labels, then getTask) and DeadlinePopover + pure deadlinePresets.resolvePreset.
• Docs synced: architecture, engineering-guidelines (JsonElement partial-PATCH pattern), product-design, README, CHANGELOG, coverage.

Verified:

• 63 backend / 65 MCP / 47 frontend unit tests pass; clean production next build; clean tsc.
• Deployed to the phone (exit 0, all 4 services restarted fresh).
• Live curl against the deployed backend: title set, deadline set, deadline clear (null), empty-title 400, bad-date 400, unknown-id 404, cleanup 204. Present-key semantics confirmed at the real HTTP-binding layer.
• The flagged Block (deadline-clear not detected) was investigated and disproven; review fixes R1/R2/R5/R7 applied inline.
• Deferred: Step 6.3 hands-on connector + browser acceptance spot-check (user-only, non-blocking).

Issues raised during this work:

• Code-review follow-ups from #59: extract useClickOutside hook + revisit poll-pause scope #60 - code-review follow-ups (extract useClickOutside hook R4; revisit poll-pause scope R3). Non-blocking.

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Issues raised from code review:

• Code-review follow-ups from #59: extract useClickOutside hook + revisit poll-pause scope #60 - extract useClickOutside hook (R4) + revisit poll-pause scope (R3)

These are tracked separately and do not block shipping. R1, R2, R5, R7 were fixed inline; the one finding flagged as a Block was investigated and disproven (deadline-clear detection is correct); R6 and R8 needed no change.

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Documentation updated:

• README.md - editing added to Features; roadmap swapped (editing shipped -> priority + bulk actions next)
• docs/product-design.md - title/deadline now editable post-creation; MCP tool count 15 -> 16; update_task noted
• docs/architecture.md - EditTaskModal + DeadlinePopover + deadlinePresets added to the frontend tree; PATCH endpoint + tool count already synced during execute
• docs/engineering-guidelines.md - JsonElement partial-PATCH pattern (done during execute)
• CHANGELOG.md + docs/tests/coverage.md - v2.10.2 section + new test counts (done during execute)

Ready for /ship.

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Closed by v2.10.2 release. See outcome above. Release: https://github.com/hydraInsurgent/Tasklog/releases/tag/v2.10.2

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Release: https://github.com/hydraInsurgent/Tasklog/releases/tag/v2.10.2