v0.210.0 — R-259 and R-258: two pictures that were not true

Both are one shape: something the box already knows, drawn as its opposite.

R-259 — A DISK WE FAILED TO READ WAS DRAWN AS A HEALTHY EMPTY DISK. readDiskUsage
(internal/system/info_linux.go) logged a statfs failure at DEBUG and returned, leaving the caller's
TotalGB/UsedGB/AvailGB/Percent at zero — and usageColor(0) is "nominal". The dashboard's
most-looked-at meter therefore rendered "0.0 GB / 0.0 GB (0%)" with a 0%-wide bar in the healthy
colour. "We could not look" and "there is plenty of room" were the same picture.

readDiskUsage now returns whether the measurement succeeded; SystemInfo gains DiskKnown and
HDDKnown (HDDConfigured is not a substitute: it says a path was configured, not that reading it
worked); and the template draws NO figure, NO percentage and NO meter fill when unknown, saying
"A tarhely merete most nem olvashato ki." instead. A healthy box is byte-identical, colour band
included.

This session rules the convention (felhom.eu CONTEXT.md S-39): an explicit `...Known bool` companion
beside the figures, checked in the template — the shape Offbox.StatsKnown already uses, whose own
comment says "a 0%-wide bar over an unread store is a picture of emptiness, and a picture is a
claim". Pointers and separate error fields are both legitimate Go, but a codebase with three
dialects cannot be gated (ROADMAP G-3 was blocked on exactly this). Existing call sites NOT
converted.

R-258 — THE PER-APP BACKUP TICK WAS GREEN ON PRESENCE, AND RED ONLY ON A GLOBAL CONDITION.
buildAppBackupRows set Tier1LastStatus from status.LastDBDump.Success, which is the box's single
most recent dump RUN, whichever app it belonged to. An app whose own dump failed showed a tick as
long as some other app dumped successfully afterwards; an app with no database took the nil branch
and went green on the mere existence of a restore point.

appDumpVerdict now reads THIS app's own entries in DBDumpStatus.Results (matched on
DumpResult.DB.StackName, failure = non-nil Error). Three states: any failing database -> error; all
clean -> ok; no result recorded -> NO verdict and no icon, titled "Errol a mentesrol nincs
eredmenyunk." The recovery unit carries no per-run outcome of its own, so green cannot honestly be
derived from presence. The global tier1DBStatus label is untouched — it is correct as a global.

RECENCY IS DELIBERATELY NOT ADDED. A tick over a three-week-old restore point is a real weakness,
but an age threshold means inventing a number and the time is already printed beside the icon.
Recorded as an observation, not changed.

AN EXISTING TEST WAS ASSERTING THE DEFECT AND WAS CORRECTED, NOT DELETED:
TestBuildAppBackupRows_Tier1FromRestorePoints expected "ok" for a status with no LastDBDump at all —
green from nothing but a file's existence. It now expects no verdict; its real subject, the
Tier1LastRun time, is unchanged.

The dashboard test EXTRACTS the meter block from the shipped template rather than copying it: a
copied block drifts, and a drifted copy passes while the page it claims to cover has changed — the
fixture-is-not-the-wire mistake this project has now hit twice.

Six red-proofs across both parts, each with the mutation asserted applied.

No new tag on any declared wire — report/builder.go maps into its own types and is untouched;
wire_contract_gate.py confirmed green.

go build / go vet / go test ./... green (28 packages), controller_gates --fast all OK, both run
separately from this commit.

controller/internal/web/templates/backups_apps.html

@@ -169,9 +169,14 @@
                     <span class="layer-badge">Auto</span>
                     <span class="tier-location">helyi</span>
                     {{if .Tier1LastRun}}
+                    {{/* R-258: three states. The tick is THIS app's own most recent dump result,
+                         not the box's most recent run — and a third value renders NO icon, which is
+                         where "we have no result for this backup" belongs. A tick standing for
+                         "a file exists" is what this replaced. */}}
                     <span class="layer-last">Utolsó: {{timeAgoStr .Tier1LastRun}}
                         {{if eq .Tier1LastStatus "ok"}}<span class="text-ok"><svg class="ico ico-sm"><use href="#i-check"/></svg></span>
-                        {{else if eq .Tier1LastStatus "error"}}<span class="text-error"><svg class="ico ico-sm"><use href="#i-x"/></svg></span>{{end}}
+                        {{else if eq .Tier1LastStatus "error"}}<span class="text-error"><svg class="ico ico-sm"><use href="#i-x"/></svg></span>
+                        {{else}}<span class="state-text-neutral" title="Erről a mentésről nincs eredményünk.">—</span>{{end}}
                     </span>
                     {{end}}
                     <span class="tier-contents">{{.BackupContents}}</span>

controller/internal/web/templates/dashboard.html

@@ -53,6 +53,21 @@
         {{end}}
     </div>
     <div class="system-info-items" style="margin-top: 1rem;">
+        {{/* R-259: the figures and the bar render ONLY when the measurement succeeded. A statfs
+             failure used to leave every number at zero, and usageColor(0) is "nominal" — so a disk
+             we could not read was drawn as a healthy empty one. Same reasoning as the off-site
+             card: a 0%-wide bar over an unmeasured store is a picture of emptiness, and a picture
+             is a claim. */}}
+        {{if not .SystemInfo.DiskKnown}}
+        <div class="system-info-item meter meter-empty">
+            <div class="system-info-header">
+                <span class="system-info-label">Rendszer (/)</span>
+                <span class="system-info-value">— <span class="state-text-neutral">nem ismert</span></span>
+            </div>
+            <div class="meter-track"></div>
+            <div class="meter-flag">A tárhely mérete most nem olvasható ki.</div>
+        </div>
+        {{else}}
         {{$duc := usageColor .SystemInfo.DiskPercent}}
         <div class="system-info-item meter {{$duc}}">
             <div class="system-info-header">
@@ -64,6 +79,7 @@
             </div>
             {{if eq $duc "warn"}}<div class="meter-flag"><svg class="ico"><use href="#i-triangle-alert"/></svg>Fogyóban a hely</div>{{else if eq $duc "crit"}}<div class="meter-flag"><svg class="ico"><use href="#i-triangle-alert"/></svg>Kritikusan kevés hely</div>{{end}}
         </div>
+        {{end}}
         {{range .StorageBars}}
         {{if .Disconnected}}
         <div class="system-info-item meter meter-empty storage-disconnected">