feat(shares,tasks): centralized Additional Shares approval queue, remove unused Share Savings Debit

- Add Approval Center tab "Share Addition Requests": lists every pending additional-share tranche
  across all accounts (backed by the new /v1/shareadditionrequests endpoint), with a detail popup
  showing the board resolution and the route-specific proof of funding (voucher(s) for cash, or the
  linked savings account for savings). Approve/Reject call the same native
  approveadditionalshares/rejectadditionalshares commands the account-page buttons already used.
- Remove "Debit from Savings" dialog/button and the "Share Savings Debit" Checker Inbox tab -- zero
  rows ever recorded on either tenant since it was built.
- Remove "Approve Additional Shares"/"Reject Additional Shares" from the account-page menu now that
  every tranche is reviewed from the centralized queue instead.
- Harden SharesButtonsConfiguration.removeButton(): a not-found name fed to splice(-1, 1) was quietly
  deleting the LAST button in the array instead of doing nothing -- removing the two menu entries
  above would otherwise have silently broken the rest of the Active-account button bar.

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

src/app/cashier/cashier.service.ts

@@ -424,45 +424,16 @@ export class CashierService {
     return this.http.post(`/shareadvancecollection/${collectionId}/apply`, data);
   }
 
-  /**
-   * Whether this share account can be settled from the member's linked savings, and for how much.
-   *
-   * Reports a shortfall before the clerk raises anything, so the member can be told at the counter
-   * rather than after a request has been submitted and has to be rejected.
-   * @returns {Observable<any>} `{ eligible, reason, shareAmount, chargeAmount, totalRequired,
-   *   savingsAccountNo, savingsBalance }`.
-   */
-  getShareSavingsDebitEligibility(shareAccountId: number): Observable<any> {
-    return this.http.get(`/sharesavingsdebit/eligibility/${shareAccountId}`);
+  /** Every additional-share tranche awaiting approval, across every share account. */
+  getShareAdditionRequests(): Observable<any> {
+    return this.http.get('/shareadditionrequests');
   }
 
   /**
-   * Records a request to settle a share application by debiting the member's savings. Nothing moves
-   * until a manager approves it — unlike the cash route, where the cashier's receipt is already the
-   * second pair of eyes.
+   * Full detail for one pending tranche — the list row plus route-specific proof of funding: the
+   * voucher(s) behind a cash tranche, or the savings account already debited for a savings tranche.
    */
-  submitShareSavingsDebit(data: any): Observable<any> {
-    return this.http.post('/sharesavingsdebit', data);
-  }
-
-  /** Savings-debit requests, PENDING by default. */
-  getShareSavingsDebitRequests(status?: string, shareAccountId?: number): Observable<any> {
-    const params: string[] = [];
-    if (status) {
-      params.push(`status=${status}`);
-    }
-    if (shareAccountId) {
-      params.push(`shareAccountId=${shareAccountId}`);
-    }
-    return this.http.get(`/sharesavingsdebit${params.length ? '?' + params.join('&') : ''}`);
-  }
-
-  /** Debits the member's savings and issues the shares. Manager only, and not the submitting clerk. */
-  approveShareSavingsDebit(id: number): Observable<any> {
-    return this.http.post(`/sharesavingsdebit/${id}/approve`, {});
-  }
-
-  rejectShareSavingsDebit(id: number, rejectionReason?: string): Observable<any> {
-    return this.http.post(`/sharesavingsdebit/${id}/reject`, { rejectionReason });
+  getShareAdditionRequest(transactionId: number): Observable<any> {
+    return this.http.get(`/shareadditionrequests/${transactionId}`);
   }
 }