feat(admin): bug-report toggle, unify "Trennen" button styling

Bucket E+F of the v1.4.3 polish pass.

**Disconnect-button styling unified.** Three integrations had three
different "Trennen" buttons: Withings used `outline` + `text-
destructive`; moodLog used solid `destructive` (red bg, white text);
the AI/Codex card used `ghost` + `text-destructive`. Same action,
three readings — confusing. All three now use the Withings pattern
(`outline` + `text-destructive`). The actual confirmation button
inside the AlertDialog keeps its solid-red treatment so the final
"yes, do it" still reads as a strong commit.

**Bug-report explicit on/off toggle.** Until v1.4.3 the bug-report
feature was implicitly gated on "is the GitHub token + repo
configured". An admin who wanted to *temporarily* hide the report
button (e.g. during a freeze window) had to clear the encrypted
token, forcing re-entry on resume — destructive for a reversible
intent. Migration `0027_bug_report_enabled_toggle` adds
`app_settings.bug_report_enabled BOOLEAN NOT NULL DEFAULT TRUE`,
the admin settings schema accepts `bugReportEnabled`, and a Switch
in the admin → Bug Report card lets the operator flip it.
`POST /api/bugreport` now returns 503 ("Bug reports are disabled by
the administrator") when the flag is off — the client already
renders a "not configured" screen on that status, so the report
button hides gracefully without further client-side wiring.

i18n keys added: `admin.bugReportEnabledLabel` + `…Description` in
both DE and EN.

Tests + typecheck green (671/671).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/settings/ai-section.tsx

@@ -277,8 +277,11 @@ function InsightsSettingsCard({
                   )}
                 </p>
               </div>
+              {/* v1.4.3: aligned with the Withings/moodLog disconnect
+                  buttons — outline + text-destructive so the same action
+                  reads the same everywhere in Settings. */}
               <Button
-                variant="ghost"
+                variant="outline"
                 size="sm"
                 className="text-destructive shrink-0"
                 onClick={handleDisconnect}

src/components/settings/integrations-section.tsx

@@ -644,7 +644,16 @@ function MoodLogCard() {
 
             <AlertDialog>
               <AlertDialogTrigger asChild>
-                <Button variant="destructive" size="sm">
+                {/* v1.4.3: aligned with the Withings disconnect button —
+                    outline + text-destructive instead of solid destructive
+                    so the trigger reads as a reversible action; the actual
+                    "yes, disconnect" confirmation inside the dialog keeps
+                    its solid-red treatment. */}
+                <Button
+                  variant="outline"
+                  size="sm"
+                  className="text-destructive"
+                >
                   <Unlink className="mr-2 h-4 w-4" />
                   {t("settings.moodLogDisconnect")}
                 </Button>