Merge pull request 'Phase 14c: CIENG_Tank trend padded so it draws in the HTML display' (#18) from docs/phase-14c-tank-trend into main

Reviewed-on: cliu/ci-server-config#18

.claude/skills/graphics/tasks/create-display.md

@@ -57,4 +57,5 @@ Text `CI-Eng-Sample Tank 1`, number field on `TANK1.LEVEL` (live: 72 → 61), al
 (no filter; listed the TANK1.LEVEL alarms), trend pen `TANK1.LEVEL` (legend
 `CI-Eng-Sample.TANK1.LEVEL [CIENG_SCAN10S]` = highest-priority storage group). In the HTML
 display the trend drew no line: a trend needs 50 visible pens to draw on the web (ISS-041;
-workaround and all trend settings in `trend.md`).
+workaround and all trend settings in `trend.md`). The sample file is now padded with
+`add_trend_spares.ps1` (49 spares) and draws in the browser too.

examples/CI-Eng-Sample/README.md

@@ -110,7 +110,7 @@ New items start with status 13 (`NOT INIT`) until a value is written.
 | `equipment/eqpciengslv_start.cmd`, `_stop.cmd` | Start/stop the Modbus slave mirror (copy to `tls\com`) |
 | `76_`…`93_remove_*.qli` | Names to delete, in reverse order (audit `79`, reports and printer `83`/`84` first, alarm definitions last, `93`) |
 | `load.cmd`, `remove.cmd` | Run the steps in the right order |
-| `displays/CIENG_Tank.xml` | Display (HTML mode): title, number field on `TANK1.LEVEL`, `PUMP1.MODE` field with buttons *Manual (0)* / *Auto (1)* (write the item), alarm overview, trend of `TANK1.LEVEL`, button *Operator layout* |
+| `displays/CIENG_Tank.xml` | Display (HTML mode): title, number field on `TANK1.LEVEL`, `PUMP1.MODE` field with buttons *Manual (0)* / *Auto (1)* (write the item), alarm overview, trend of `TANK1.LEVEL` (padded with 49 spare pens so it also draws in the browser), button *Operator layout* |
 | `19b_audit_item_df.qli` | *Audit trailing wanted* for `PUMP1.MODE` (loaded with `dssqld -m`) |
 | `displays/CIENG_Menu.xml` | Navigation display (200 x 700): *Tank 1*, *Current Alarm* (main frame), *Tank 1 popup* (layout `popup`) |
 | `layouts/CIENG_Operator.xml`, `layouts/layout.ps1` | Operator layout block and the script that adds/removes it in `Layouts.xml` |
@@ -179,7 +179,7 @@ Trends: `TANK1.LEVEL` and `TANK1.INFLOW` are internal items and stay `NOT INIT`
 Server start, so trends stay empty. `powershell -ExecutionPolicy Bypass -File
 displays\trend_feed.ps1 -Seconds 3600` writes test values every 5 s. `CIENG_TrendLab` (also
 in the browser: `?d=CIENG_TrendLab`) shows the trend padded to 50 pens, which the HTML display
-needs to draw (ISS-041); `CIENG_Tank`'s trend has 1 pen and draws only on the desktop.
+needs to draw (ISS-041); `CIENG_Tank`'s trend is padded the same way (1 real pen + 49 spares).
 
 Remove: `layouts\layout.ps1 -Remove` (restores the file exactly) and
 `displays\remove_displays.cmd`. Close the displays in the Edit Module first. See skill