feat(inventory): replace prompt dialogs with inline editing

Replaced all prompt() and confirm() dialogs with contenteditable fields
and inline UI components for a better user experience.

Changes:
- Made inventory fields (On Person, Stored items, Assets) contenteditable
  with blur-to-save functionality
- Replaced "Add Location" prompt with inline form (hidden by default)
- Replaced "Remove Location" confirm with inline confirmation UI
- Added CSS styling for inline editing states (hover, focus, empty)
- Added CSS for inline forms, buttons, and confirmation UI
- Fixed bug where inventory sub-tabs were unclickable due to
  incorrect container ID in toggleLocationCollapse() and
  switchInventoryTab() functions

All inline edits now save automatically on blur, matching the UX
pattern used elsewhere in the extension (mood/conditions fields).

style.css

@@ -4109,6 +4109,121 @@ body:has(.rpg-panel.rpg-position-left) #sheld {
     color: white;
 }
 
+/* Inline Editing Styles */
+.rpg-inventory-text.rpg-editable {
+    cursor: text;
+    transition: all 0.2s ease;
+    min-height: 2rem;
+}
+
+.rpg-inventory-text.rpg-editable:hover {
+    background: var(--SmartThemeQuoteColor);
+    border-color: var(--ac-style-color-matchedText);
+}
+
+.rpg-inventory-text.rpg-editable:focus {
+    outline: none;
+    border-color: var(--ac-style-color-matchedText);
+    background: var(--SmartThemeEmColor);
+    box-shadow: 0 0 0 2px rgba(var(--ac-style-color-matchedText-rgb, 66, 135, 245), 0.2);
+}
+
+.rpg-inventory-text.rpg-editable:empty::before {
+    content: 'Click to edit...';
+    color: var(--SmartThemeFastUISliderColColor);
+    font-style: italic;
+}
+
+/* Inline Forms */
+.rpg-inline-form {
+    display: flex;
+    flex-direction: column;
+    gap: 0.5rem;
+    padding: 0.75rem;
+    background: var(--SmartThemeQuoteColor);
+    border: 1px solid var(--ac-style-color-matchedText);
+    border-radius: 0.25rem;
+    margin-bottom: 0.75rem;
+}
+
+.rpg-inline-input {
+    padding: 0.5rem 0.75rem;
+    background: var(--SmartThemeBlurTintColor);
+    border: 1px solid var(--SmartThemeBorderColor);
+    border-radius: 0.25rem;
+    color: var(--SmartThemeBodyColor);
+    font-size: 0.9rem;
+    font-family: inherit;
+}
+
+.rpg-inline-input:focus {
+    outline: none;
+    border-color: var(--ac-style-color-matchedText);
+    box-shadow: 0 0 0 2px rgba(var(--ac-style-color-matchedText-rgb, 66, 135, 245), 0.2);
+}
+
+.rpg-inline-buttons {
+    display: flex;
+    gap: 0.5rem;
+    justify-content: flex-end;
+}
+
+.rpg-inline-btn {
+    padding: 0.4rem 0.75rem;
+    border: 1px solid var(--SmartThemeBorderColor);
+    border-radius: 0.25rem;
+    background: var(--SmartThemeBlurTintColor);
+    color: var(--SmartThemeBodyColor);
+    cursor: pointer;
+    transition: all 0.2s ease;
+    font-size: 0.85rem;
+    display: flex;
+    align-items: center;
+    gap: 0.35rem;
+}
+
+.rpg-inline-btn:hover {
+    opacity: 0.85;
+}
+
+.rpg-inline-cancel {
+    background: var(--SmartThemeBlurTintColor);
+    color: var(--SmartThemeFastUISliderColColor);
+}
+
+.rpg-inline-cancel:hover {
+    background: #6c757d;
+    border-color: #6c757d;
+    color: white;
+}
+
+.rpg-inline-save,
+.rpg-inline-confirm {
+    background: var(--ac-style-color-matchedText);
+    border-color: var(--ac-style-color-matchedText);
+    color: white;
+}
+
+.rpg-inline-save:hover,
+.rpg-inline-confirm:hover {
+    opacity: 0.85;
+}
+
+/* Inline Confirmation */
+.rpg-inline-confirmation {
+    padding: 0.75rem;
+    background: var(--SmartThemeQuoteColor);
+    border: 1px solid #dc3545;
+    border-radius: 0.25rem;
+    margin-top: 0.5rem;
+}
+
+.rpg-inline-confirmation p {
+    margin: 0 0 0.75rem 0;
+    color: var(--SmartThemeBodyColor);
+    font-size: 0.9rem;
+}
+
 /* ============================================
    DESKTOP TABS SYSTEM
    ============================================ */