feat(studio): Doctor + Modules localized + sparse-store federation nudge (v0.25.0)

Two threads.

Translation expansion: every visible string on the Doctor
page (section headers, status text, button labels, daemon-
control card, daemon-files panel, update banner) and the
Modules page (recent-activity strip, capabilities label,
uninstall dialog + toast) flips between DE and EN with the
sidebar toggle. Adds ~50 ARB keys split between
`app_en.arb` / `app_de.arb`. Pluralised + parametrised
strings (`{n} events verified`, `Running on {name}: {endpoint}`)
use the standard ICU placeholder syntax so future locales
slot in without code changes.

Sparse-store federation nudge: the Store page renders an
inline banner above the grid when the operator has zero
federated entries — single biggest store-fullness lever is
configuring an MCP server / n8n endpoint, so the banner
says exactly that and the button opens Settings straight
to the editor. Banner dismisses automatically the next
render after a federated entry appears.

Coverage stand for translation: Doctor + Modules + sidebar
+ page titles + nav + Cmd+K labels are bilingual. Settings
dialog, Approvals cards, Audit drilldown, MCP/n8n editors,
Store search hint + filter chips remain English-literal.
The infrastructure (ARB plumbing, generator hookup,
locale-notifier) means each follow-up surface is a
one-line ARB edit + one call-site swap.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/l10n/app_en.arb

@@ -62,6 +62,9 @@
   "@storeNResults": {
     "placeholders": { "n": { "type": "int" } }
   },
+  "storeFederationNudgeTitle": "Want more capabilities?",
+  "storeFederationNudgeBody": "Configure an MCP server or n8n endpoint in Settings → MCP Clients / N8N Endpoints. Discovered tools and workflows surface here as `mcp.<server>.<tool>` and `n8n.<endpoint>.<workflow>` capabilities — every Anthropic / community MCP server adds a handful at once.",
+  "storeFederationNudgeButton": "Open Settings",
 
   "auditTitle": "Audit",
   "auditNoEvents": "No events yet",
@@ -69,7 +72,32 @@
 
   "modulesTitle": "Modules",
   "modulesNoneTitle": "No modules yet",
+  "modulesNoneHint": "Run `fai install <capability-name>` or check ~/.fai/modules/.",
+  "modulesReloadTooltip": "Reload",
   "modulesRecentActivity": "RECENT ACTIVITY",
+  "modulesRecentActivityHint": "last {n} install/uninstall events from the audit log",
+  "@modulesRecentActivityHint": { "placeholders": { "n": { "type": "int" } } },
+  "modulesActivityInstalled": "installed",
+  "modulesActivityUninstalled": "uninstalled",
+  "modulesCapabilitiesLabel": "Capabilities",
+  "modulesUninstallTitle": "Uninstall module?",
+  "modulesUninstallBody": "Removes {name} v{version} from this hub. Flows that reference it will fail at the next run. A `module.uninstalled` audit event is recorded.",
+  "@modulesUninstallBody": {
+    "placeholders": {
+      "name": { "type": "String" },
+      "version": { "type": "String" }
+    }
+  },
+  "modulesUninstalledToast": "Uninstalled {name} v{version}.",
+  "@modulesUninstalledToast": {
+    "placeholders": {
+      "name": { "type": "String" },
+      "version": { "type": "String" }
+    }
+  },
+  "modulesUninstallFailed": "Uninstall failed: {error}",
+  "@modulesUninstallFailed": { "placeholders": { "error": { "type": "String" } } },
+  "modulesUninstalling": "Uninstalling…",
 
   "approvalsTitle": "Approvals",
   "approvalsTabPending": "Pending",
@@ -78,6 +106,73 @@
   "approvalsInboxHint": "All caught up. New `system.approval@^0` steps land here automatically.",
 
   "doctorTitle": "Doctor",
+  "doctorRecheckTooltip": "Re-check",
+  "doctorEventLogSection": "Event log",
+  "doctorModulesApprovalsSection": "Modules & approvals",
+  "doctorHostServicesSection": "Host services",
+  "doctorDaemonFilesSection": "Daemon files",
+  "doctorDaemonControlSection": "Daemon control",
+  "doctorChainIntact": "Hash chain intact",
+  "doctorChainIntactDetail": "{n} events · prev_event_sha256 verified end-to-end",
+  "@doctorChainIntactDetail": { "placeholders": { "n": { "type": "int" } } },
+  "doctorChainTampered": "Tampering detected",
+  "doctorChainTamperedDetail": "{verified} of {total} verified before mismatch at {id}",
+  "@doctorChainTamperedDetail": {
+    "placeholders": {
+      "verified": { "type": "int" },
+      "total": { "type": "int" },
+      "id": { "type": "String" }
+    }
+  },
+  "doctorChainPillOk": "WORM-1",
+  "doctorChainPillTamper": "TAMPER",
+  "doctorVerifyNow": "Verify now",
+  "doctorRestart": "Restart",
+  "doctorStart": "Start",
+  "doctorStop": "Stop",
+  "doctorStatusAction": "Status",
+  "doctorRunningOn": "Running on {name}: {endpoint}",
+  "@doctorRunningOn": {
+    "placeholders": {
+      "name": { "type": "String" },
+      "endpoint": { "type": "String" }
+    }
+  },
+  "doctorStoppedOn": "{name} daemon stopped",
+  "@doctorStoppedOn": { "placeholders": { "name": { "type": "String" } } },
+  "doctorStatusUnknown": "Daemon status: …",
+  "doctorPillRunning": "running",
+  "doctorPillStopped": "stopped",
+  "doctorDaemonControlHint": "Studio shells out to the platform binary — mirrors `fai daemon …` exactly so the CLI and UI stay in lockstep.",
+  "doctorDaemonControlWorking": "Working…",
+  "doctorPathLog": "Log",
+  "doctorPathConfig": "Config",
+  "doctorPathDb": "Audit DB",
+  "doctorPathModules": "Modules dir",
+  "doctorPathFlows": "Flows dir",
+  "doctorPathPid": "PID file",
+  "doctorPathsEmpty": "Daemon did not report file paths. Update the running hub via `fai daemon restart`.",
+  "doctorOpenError": "Could not open: {detail}",
+  "@doctorOpenError": { "placeholders": { "detail": { "type": "String" } } },
+  "doctorUpdateAvailable": "Update available — {version}",
+  "@doctorUpdateAvailable": { "placeholders": { "version": { "type": "String" } } },
+  "doctorUpdateBody": "Channel {channel} now offers {version}. Apply via the button — Studio shells out to `fai update apply --channel {channel}`.",
+  "@doctorUpdateBody": {
+    "placeholders": {
+      "channel": { "type": "String" },
+      "version": { "type": "String" }
+    }
+  },
+  "doctorUpdateUnreachable": "Release host unreachable",
+  "doctorUpdateUnreachableBody": "Could not contact the release feed for {channel}.",
+  "@doctorUpdateUnreachableBody": { "placeholders": { "channel": { "type": "String" } } },
+  "doctorReleaseNotes": "notes: {url}",
+  "@doctorReleaseNotes": { "placeholders": { "url": { "type": "String" } } },
+  "doctorPillNew": "new",
+  "doctorPillOffline": "offline",
+  "doctorApplyUpdate": "Apply update",
+  "doctorApplying": "Applying…",
+  "doctorApplyDone": "Update applied. Restart Studio to see the new daemon version.",
 
   "mcpHeader": "MCP CLIENTS",
   "mcpHint": "External MCP servers federate their tools as `mcp.<server>.<tool>` capabilities. Configure once, see them in the Store.",