fix(admin): P0 user-reported bugs - raw keys, table overflow, builder escape route

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

- Transactions: 'adminTransactions.flag'/'clearFlag' raw keys rendered on the fraud toggle button (missed by earlier audit because the key sits inside a ternary); added en/ru/hy strings with merchant wording ('Flag as suspicious')
- Table overflow on Customers/Transactions root-caused: app-table host is a grid item with default min-width:auto, so wide tables stretched their parent card instead of scrolling inside the wrapper; shared TableComponent now declares display:block/min-width:0/max-width:100% on its element selector (encapsulation None - :host would not match), fixing every admin table at once; verified in browser: cards contained, wrapper scrolls internally
- Builder trap root-caused: section editor pages (/:lang/edit/<section>) had zero routes to the backoffice - only a link back to the builder overview - so admins inside a section could not return to the dashboard; sidebar now has a persistent 'Back to dashboard' link (new builder.backToDashboard key, en/ru/hy); verified navigation lands on /ru/backoffice/dashboard

src/app/i18n/en.ts

@@ -686,6 +686,7 @@ export const en: Translations = {
     linkUrlDesc: 'Path or URL this navigation link points to.',
     linkVisibleDesc: 'Whether this navigation link is shown to shoppers.',
     appName: 'Marketplace Builder',
+    backToDashboard: 'Back to dashboard',
     breadcrumbRoot: 'Marketplace Builder',
     statusComplete: 'Complete',
     statusInProgress: 'In progress',
@@ -1628,6 +1629,8 @@ export const en: Translations = {
     method: 'Payment method',
     fraud: 'Fraud check',
     flagged: 'Flagged',
+    flag: 'Flag as suspicious',
+    clearFlag: 'Clear flag',
     retry: 'Retry',
     audit: 'History',
     emptyTitle: 'No transactions found',