fix: pass workspace directory in Files API requests (#1588)

* fix: pass effective workspace directory in Files API requests

The web Files API used useDirectoryStore.currentDirectory as the
workspace root, but the FilesView's effective directory comes from
useEffectiveDirectory() which can differ (e.g. worktree sessions).
When they diverged the server rejected file reads with 'Path is
outside of active workspace'.

Add directory override to FileReadOptions so callers can pass the
effective directory per-call. The FilesView now passes its root
(from useEffectiveDirectory) through readFile, statFile, image/PDF
URLs, and the desktop image fallback. The server receives the
correct workspace root via x-opencode-directory header or directory
query parameter.

Fixes #1456

* fix: cover files workspace directory regressions

* fix: sync directory store on draft session and forward cache options

The content cache wrapper in RuntimeAPIProvider was dropping the
options parameter (including the per-call directory override) when
making internal statFile and readFreshFile calls during cache
validation and misses. This caused the underlying web API to fall
back to getDirectory() which reads useDirectoryStore.currentDirectory.

Additionally, openNewSessionDraft, setNewSessionDraftTarget, and
overrideNewSessionDraftTarget updated the draft's directory without
ever syncing useDirectoryStore. Since the web API's getDirectory()
reads from that store, it returned the stale previous-project
directory during draft sessions, causing 'Path is outside of active
workspace' errors when opening files.

Forward options through all internal calls in the content cache
wrapper, and sync useDirectoryStore via setDirectory() whenever the
draft session directory changes.

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/ui/src/contexts/RuntimeAPIProvider.tsx

@@ -100,20 +100,20 @@ function withContentCache(files: FilesAPI): FilesAPI {
         if (hit) {
           // Validate cached entry is still fresh
           if (files.statFile) {
-            const latest = await files.statFile(path).catch(() => {
+            const latest = await files.statFile(path, options).catch(() => {
               removeCacheEntry(path);
               return null;
             });
             if (!latest || !statMatches(hit, latest)) {
               removeCacheEntry(path);
-              return readFreshFile(path);
+              return readFreshFile(path, options);
             }
           }
           touchContentLru(path);
           return { content: hit.content, path: hit.path };
         }
 
-        return readFreshFile(path);
+        return readFreshFile(path, options);
       }
     : undefined;