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/translations.ts

@@ -684,6 +684,7 @@ export interface Translations {
     linkUrlDesc: string;
     linkVisibleDesc: string;
     appName: string;
+    backToDashboard: string;
     breadcrumbRoot: string;
     statusComplete: string;
     statusInProgress: string;
@@ -1635,6 +1636,8 @@ export interface Translations {
     method: string;
     fraud: string;
     flagged: string;
+    flag: string;
+    clearFlag: string;
     retry: string;
     audit: string;
     emptyTitle: string;