Rebuild the dashboard around what needs a person

The board was one card per source in a fixed grid: every source got the same
small box whatever it had to say (warranties showed 5 of 50), and a box per
source flattened priority, while the largest type on the page belonged to counts
that need nobody.

Now a severity rollup, one worst-first queue of everything needing a person, and
a row of context beneath. The queue is full width, capped per source so a noisy
check cannot bury a rare one, and names what did not fit with a link to it. Chips
filter the queue by check as well as by severity; both narrow what is already
loaded, so the counts and rows cannot disagree.

Dropped: an 'All assets' tile shown beside its own four addends, a printer strip
carrying the same count a third time, three cards whose job was to display 0, and
a Recent Devices table listing five machines all 'In Use'.

Contract 0.26.0 adds optional 'shortname' on dashboard cards - a title is written
as a heading and ran wider than the hostname it qualified as a row badge.

Also: the supplies card reported 'Low Supplies 0' when Zabbix was unreachable,
which reads as reassurance rather than the truth that nothing could see the
cartridges. It now distinguishes unreachable (says so) from unconfigured (stays
quiet - the site declined the feature) from a real zero.

Full suite 2182 passed, frontend 314 passed.

shopdb/__init__.py

@@ -88,7 +88,12 @@ from .plugins import plugin_manager
 # emission never consulted the caller, so a read-only viewer was shown controls
 # over a shop-floor PC that 403 on click. Guests are included, since a signed-out
 # visitor holds whatever the guest role was granted. Additive name, minor bump.
-__contract_version__ = '0.25.0'
+# 0.26.0: dashboard cards may declare 'shortname'. The dashboard merged its
+# per-source cards into one worst-first queue, and a card's 'title' is written
+# as a heading - "Endpoints with crashes or shutdowns" - which as a row badge
+# ran wider than the hostname it qualified. Optional, defaults to the title, so
+# a plugin that does not declare one is unaffected. Additive field, minor bump.
+__contract_version__ = '0.26.0'
 
 # Product release version (see ADR-007). The product version and the
 # plugin-contract version above are distinct series with independent

shopdb/plugins/base.py

@@ -238,6 +238,9 @@ class BasePlugin(ABC):
         Each card: {
             'id': str,          # stable, unique across plugins
             'title': str,       # heading
+            'shortname': str,   # optional: label for this card's rows in the
+                                # merged queue. A title reads as a header and is
+                                # too long as a row badge; defaults to title.
             'endpoint': str,    # API path the card fetches its own data from
             'render': str,      # core renderer: 'exceptions' | 'list' | 'stat'
             'severity': str,    # 'critical' | 'warning' | 'info' - orders cards