### Title:
`Session.prototype.resetRequest` clears `rebuildCiteprocState`, causing `TypeError: can't access property "citationItems", c is undefined` when citing after session disruption or style re-init

### Environment:
- Zotero 7.x, 8.x, 9.x, 10.0.5, 10.0.6
- Word for Windows / LibreOffice Integration
- `extensions.zotero.cite.useCiteprocRs = false` (default)

### Description:
When a word processor integration session requires its processor state to be rebuilt (e.g. after a session disruption / RPC reconnect, style re-initialization via `resetSessionStyles()`, or when an empty CSL engine is paired with an existing session cache), inserting a citation fails with:

1. **During preview in the citation dialog:**
```text
TypeError: can't access property "citationItems", c is undefined
CSL.Engine.prototype.processCitationCluster@chrome://zotero/content/xpcom/citeproc.js:7056:25
CSL.Engine.prototype.previewCitationCluster@chrome://zotero/content/xpcom/citeproc.js:6990:20
Zotero.Integration.Session.prototype.cite/previewFn<@chrome://zotero/content/xpcom/integration.js:1583:31
```

2. **Upon accepting the citation dialog:**
```text
TypeError: can't access property "properties", this.registry.citationreg.citationById[preCitation[0]] is undefined
CSL.Engine.prototype.processCitationCluster@chrome://zotero/content/xpcom/citeproc.js:7158:9
Zotero.Integration.Session.prototype._updateCitations@chrome://zotero/content/xpcom/integration.js:2297:45
```
Word displays `"An error occurred while updating your document"`.

---

### Root Cause Analysis:

1. **Rebuild Flag Mechanism:**
In `xpcom/integration.js`, whenever the CSL engine needs to repopulate existing citations into its registry, Zotero flags `session.rebuildCiteprocState = true` (e.g. in `getSession`: line 574; `setData`: line 2007; `setDocPrefs`: line 2088).
The intention is that `updateFromDocument` will restore processor state at lines 1192–1195:
```javascript
if (this.rebuildCiteprocState) {
this.restoreProcessorState();
this.rebuildCiteprocState = false;
}
```

2. **Premature Clearing in `resetRequest`:**
When `session.cite()` begins, it calls `this.updateFromDocument(FORCE_CITATIONS_FALSE)`.
The very first call in `updateFromDocument` (line 1161) is `this.resetRequest(this._doc)`.
In `Session.prototype.resetRequest(doc)` (line 1914):
```javascript
// Reloads citeproc with all citation data.
this.rebuildCiteprocState = false;
```
Because `forceUpdateAllCitations` is `0`, line 1174 is skipped.
Consequently, by line 1192 `this.rebuildCiteprocState` is already `false`, and `restoreProcessorState()` is skipped completely.

3. **Why the TypeErrors occur:**
When existing citations are already in `this.citationsByIndex`, `resetRequest` preserves them in `this.oldCitations`, so they are not flagged in `this.newIndices`.
When `previewFn` calls `this.getCiteprocLists()`, all preceding citations in the document are passed into `citationsPre`.
Citeproc looks up the first citation ID in `this.registry.citationreg.citationById`. Because `restoreProcessorState()` was skipped, `citationById` is empty. Accessing `c.citationItems` in `citeproc.js:7056` (and subsequently `.properties` in line 7158) throws the TypeErrors.

---

### Suggested Fix:

In `xpcom/integration.js`, `Session.prototype.resetRequest` should preserve any pending `rebuildCiteprocState` flag rather than wiping it:

```javascript
Zotero.Integration.Session.prototype.resetRequest = function (doc) {
this.uriMap = new Zotero.Integration.URIMap(this);
...
// Preserve rebuild flag so updateFromDocument can call restoreProcessorState()
this.rebuildCiteprocState = !!this.rebuildCiteprocState;
...
};
```
*(Line 1194 in `updateFromDocument` already clears `this.rebuildCiteprocState = false` once `restoreProcessorState()` has run).*