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/shared/ui/table/table.component.scss

@@ -1,3 +1,15 @@
+/* Block-level host that is allowed to shrink inside grid/flex parents.
+   Without min-width: 0 a wide table forces its parent card to grow past
+   its container (grid items default to min-width: auto), which is exactly
+   the "table overflows the card" bug on Customers/Transactions. */
+/* Encapsulation is None, so target the element selector directly
+   (:host would not match). */
+app-table {
+  display: block;
+  min-width: 0;
+  max-width: 100%;
+}
+
 .app-table-wrapper {
   width: 100%;
   overflow-x: auto;