Add inline editing for licenses and copy license key button

- Add inline editing for status, expiry date, and domain fields
- Add copy-to-clipboard button for license keys
- Add AJAX handlers for inline editing with nonce verification
- Update LicenseManager with updateLicenseExpiry method
- Add new translations for inline editing strings (de_CH)
- Compile updated German translations to .mo file

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

assets/css/admin.css

@@ -579,3 +579,144 @@
 #license-search-input {
     width: 280px;
 }
+
+/* Inline Editing Styles */
+.wclp-editable-cell {
+    position: relative;
+}
+
+.wclp-editable-cell .wclp-display-value {
+    display: inline;
+}
+
+.wclp-editable-cell .wclp-edit-btn {
+    opacity: 0;
+    transition: opacity 0.15s ease;
+    color: #2271b1;
+    padding: 0;
+    margin-left: 5px;
+    vertical-align: middle;
+}
+
+.wclp-editable-cell:hover .wclp-edit-btn {
+    opacity: 1;
+}
+
+.wclp-editable-cell .wclp-edit-btn .dashicons {
+    font-size: 14px;
+    width: 14px;
+    height: 14px;
+    vertical-align: middle;
+}
+
+.wclp-editable-cell .wclp-edit-btn:hover {
+    color: #135e96;
+}
+
+.wclp-edit-form {
+    display: flex;
+    align-items: center;
+    gap: 5px;
+    flex-wrap: wrap;
+}
+
+.wclp-edit-form .wclp-edit-input {
+    max-width: 150px;
+    height: 28px;
+    padding: 0 8px;
+}
+
+.wclp-edit-form .wclp-edit-input[type="date"] {
+    max-width: 130px;
+}
+
+.wclp-edit-form select.wclp-edit-input {
+    max-width: 120px;
+}
+
+.wclp-edit-form .button-small {
+    height: 26px;
+    line-height: 24px;
+    padding: 0 8px;
+    font-size: 11px;
+}
+
+.wclp-edit-form .wclp-lifetime-btn {
+    font-size: 16px;
+    padding: 0 6px;
+}
+
+/* Inline notice animation */
+.wclp-inline-notice {
+    margin: 10px 0;
+}
+
+/* Make editable cells have a minimum height for consistency */
+.licenses-table .wclp-editable-cell {
+    min-width: 120px;
+}
+
+/* Domain column wider for edit form */
+.licenses-table td[data-field="domain"] {
+    min-width: 180px;
+}
+
+/* Status column */
+.licenses-table td[data-field="status"] {
+    min-width: 150px;
+}
+
+/* Expiry column */
+.licenses-table td[data-field="expiry"] {
+    min-width: 200px;
+}
+
+/* Copy License Key Button */
+.wclp-copy-btn {
+    color: #2271b1;
+    padding: 0;
+    margin-left: 5px;
+    vertical-align: middle;
+    position: relative;
+    cursor: pointer;
+}
+
+.wclp-copy-btn:hover {
+    color: #135e96;
+}
+
+.wclp-copy-btn .dashicons {
+    font-size: 16px;
+    width: 16px;
+    height: 16px;
+    vertical-align: middle;
+}
+
+.wclp-copy-tooltip {
+    position: absolute;
+    bottom: 100%;
+    left: 50%;
+    transform: translateX(-50%);
+    background: #1d2327;
+    color: #fff;
+    padding: 4px 8px;
+    border-radius: 3px;
+    font-size: 11px;
+    white-space: nowrap;
+    z-index: 100;
+    margin-bottom: 5px;
+}
+
+.wclp-copy-tooltip::after {
+    content: '';
+    position: absolute;
+    top: 100%;
+    left: 50%;
+    transform: translateX(-50%);
+    border: 5px solid transparent;
+    border-top-color: #1d2327;
+}
+
+.wclp-license-key {
+    user-select: all;
+}