Bonsai: add Hour zoom level to the interactive Gantt chart

The jsGantt-improved library that renders Bonsai's Gantt chart already
ships full support for an "Hour" granularity (column width, header
labels in every bundled language, hour-aware rendering math). Bonsai's
config only exposed Day/Week/Month/Quarter, with a comment claiming
Hour caused browser issues even with vUseSingleCell enabled.

Headless Chrome testing against the same library version shows that
claim no longer holds once vUseSingleCell is active (as Bonsai already
configures it at 10000): Hour-format charts render without errors from
typical schedules up through fairly extreme ones (5000 tasks across a
3 year span rendered in about 2.4s). The failure mode the old comment
described only reproduces with vUseSingleCell disabled, which is not
how Bonsai runs it.

Task start/finish times already flow through to the chart unmodified
as raw ISO datetimes (tool/sequence.py create_new_task_json), so any
schedule authored with real hour-level timestamps, for example an
imported MS Project/P6/Excel schedule or one written directly through
ifcopenshell-python, can now be viewed at hour granularity. Verified
live with a night shift schedule crossing midnight, rendered correctly
with no console errors.

Note: Bonsai's own "Edit Task Time" UI currently always snaps
ScheduleStart/ScheduleFinish to 09:00/17:00 regardless of the hour
entered (ifcopenshell/api/sequence/edit_task_time.py), and work
calendars only encode working days, not working hours. So authoring a
genuine hour-precision schedule through that UI is still not possible;
this change only unlocks viewing hour-level data that already exists
in the model. Fixing the editor and calendar model is a separate,
larger design decision for a maintainer.

Addresses #2772.

Generated with the assistance of an AI coding tool.

(cherry picked from commit 727b5f3475)

src/bonsai/bonsai/bim/data/webui/static/js/gantt.js

@@ -244,7 +244,7 @@ function addGanttElement(blenderId, tasks, workSched, filename) {
       vShowTaskInfoLink: 1, // Show link in tool tip (0/1)
       vShowEndWeekDate: 0, // Show/Hide the date for the last day of the week in header for daily
       vUseSingleCell: 10000, // Set the threshold cell per table row (Helps performance for large data.
-      vFormatArr: ["Day", "Week", "Month", "Quarter"], // Even with setUseSingleCell using Hour format on such a large chart can cause issues in some browsers,
+      vFormatArr: ["Hour", "Day", "Week", "Month", "Quarter"], // vUseSingleCell keeps Hour usable on large charts.
       vShowRes: true, // Disable the resource column.
       vShowComp: false, // Disable the completion column.
       vShowDur: false, // Disable the duration column, because jsgantt doesn't calculate durations the way we want.

src/bonsai/bonsai/bim/module/sequence/gantt/index.js

@@ -12,7 +12,7 @@ function create_gantt_chart(json_data) {
         vShowTaskInfoLink: 1, // Show link in tool tip (0/1)
         vShowEndWeekDate: 0,  // Show/Hide the date for the last day of the week in header for daily
         vUseSingleCell: 10000, // Set the threshold cell per table row (Helps performance for large data.
-        vFormatArr: ['Day', 'Week', 'Month', 'Quarter'], // Even with setUseSingleCell using Hour format on such a large chart can cause issues in some browsers,
+        vFormatArr: ['Hour', 'Day', 'Week', 'Month', 'Quarter'], // vUseSingleCell keeps Hour usable on large charts.
         vShowRes: true, // Disable the resource column.
         vShowComp: false, // Disable the completion column.
         vShowDur: false, // Disable the duration column, because jsgantt doesn't calculate durations the way we want.