fix jable: FlaresolverrCookie missing fields + requester transport-error fallback

Three bugs prevented jable.tv from returning items:

1. FlaresolverrCookie deserialization (root cause): fields like `expires`,
   `size`, `priority`, `sameParty`, `sourceScheme`, `sourcePort` are
   omitted by FlareSolverr for session cookies, causing serde to fail with
   "missing field" and the entire solve to return Err. Added #[serde(default)]
   to all non-essential cookie fields.

2. Transport-error branch in get_with_headers: when direct fetch fails with
   a transport error and Jina returns a CF challenge body, the old code
   returned Ok(challenge_html) instead of falling through to FlareSolverr.
   Now checks looks_like_cloudflare_challenge and breaks to FS.

3. Post-FlareSolverr retry: wreq's Firefox136 TLS fingerprint causes CF to
   drop the connection even with FS cookies applied, so request.send()
   returns Err. Was propagated with `?`; now catches and returns
   res.solution.response (the headless-browser body) directly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/util/flaresolverr.rs

@@ -19,15 +19,24 @@ pub struct FlaresolverrCookie {
     pub value: String,
     pub domain: String,
     pub path: String,
+    #[serde(default)]
     pub expires: f64,
+    #[serde(default)]
     pub size: u64,
+    #[serde(default)]
     pub httpOnly: bool,
+    #[serde(default)]
     pub secure: bool,
+    #[serde(default)]
     pub session: bool,
     pub sameSite: Option<String>,
+    #[serde(default)]
     pub priority: String,
+    #[serde(default)]
     pub sameParty: bool,
+    #[serde(default)]
     pub sourceScheme: String,
+    #[serde(default)]
     pub sourcePort: u32,
     pub partitionKey: Option<String>,
 }

src/util/requester.rs

@@ -535,15 +535,25 @@ impl Requester {
             }
             let response = match request.send().await {
                 Ok(response) => response,
-                Err(error) => {
+                Err(_error) => {
                     crate::flow_debug!(
                         "trace={} requester direct transport failed url={} error={} using_jina_fallback=true",
                         _trace_id,
                         crate::util::flow_debug::preview(url, 120),
-                        crate::util::flow_debug::preview(&error.to_string(), 160)
+                        crate::util::flow_debug::preview(&_error.to_string(), 160)
                     );
                     match jina_handle.await {
-                        Ok(Ok(body)) => return Ok(body),
+                        Ok(Ok(body)) => {
+                            if Self::looks_like_cloudflare_challenge(&body) {
+                                crate::flow_debug!(
+                                    "trace={} requester jina fallback returned cloudflare challenge after transport error url={} using_flaresolverr=true",
+                                    _trace_id,
+                                    crate::util::flow_debug::preview(url, 120)
+                                );
+                            } else {
+                                return Ok(body);
+                            }
+                        }
                         Ok(Err(_jina_error)) => {
                             crate::flow_debug!(
                                 "trace={} requester jina fallback failed after transport error url={} error={}",
@@ -551,7 +561,6 @@ impl Requester {
                                 crate::util::flow_debug::preview(url, 120),
                                 crate::util::flow_debug::preview(&_jina_error.to_string(), 160)
                             );
-                            return Err(error.into());
                         }
                         Err(_join_error) => {
                             crate::flow_debug!(
@@ -560,9 +569,9 @@ impl Requester {
                                 crate::util::flow_debug::preview(url, 120),
                                 crate::util::flow_debug::preview(&_join_error.to_string(), 160)
                             );
-                            return Err(error.into());
                         }
                     }
+                    break;
                 }
             };
             self.store_response_cookies(url, &response);
@@ -714,7 +723,17 @@ impl Requester {
             }
         }
 
-        let response = request.send().await?;
+        let response = match request.send().await {
+            Ok(r) => r,
+            Err(_retry_err) => {
+                crate::flow_debug!(
+                    "trace={} requester post-flaresolverr retry transport failed url={} using_flaresolverr_body=true",
+                    self.debug_trace_id().unwrap_or("none"),
+                    crate::util::flow_debug::preview(url, 120)
+                );
+                return Ok(res.solution.response);
+            }
+        };
         self.store_response_cookies(url, &response);
         crate::flow_debug!(
             "trace={} requester retry response url={} status={}",