🐛 Raise validation error for incompatible binfile export options (#10341)

Requesting a binfile export with both `include-libraries` and
`embed-assets` enabled threw a raw `IllegalArgumentException`, which the
RPC layer surfaced to API clients as a generic
`:server-error`/`:unexpected` (HTTP 500) with no actionable code -- the
opaque failure reported in #7649 (perceived as an "empty" export).

The two options are genuinely mutually exclusive, so the request is
invalid input, not a server fault. Replace the raw throw in both the v1
and v3 export paths with `ex/raise :type :validation :code
:incompatible-options`, matching how the rest of the binfile code
reports bad input. Also fix the "mutally" -> "mutually" typo in the hint.

Verified on a local devenv: the export RPC now returns
`{:type :validation :code :incompatible-options}` instead of a 500, and
valid single-option exports are unaffected. Adds a regression test.

Fixes #7649

Signed-off-by: Filip Sajdak <filip.sajdak@siili.com>
Signed-off-by: Andrey Antukh <niwi@niwi.nz>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Co-authored-by: Andrey Antukh <niwi@niwi.nz>

backend/src/app/binfile/v1.clj

@@ -305,8 +305,9 @@
 (defn write-export!
   [{:keys [::bfc/include-libraries ::bfc/embed-assets] :as cfg}]
   (when (and include-libraries embed-assets)
-    (throw (IllegalArgumentException.
-            "the `include-libraries` and `embed-assets` are mutally excluding options")))
+    (ex/raise :type :validation
+              :code :incompatible-options
+              :hint "the `include-libraries` and `embed-assets` are mutually exclusive options"))
 
   (write-export cfg))
 

backend/src/app/binfile/v3.clj

@@ -222,8 +222,9 @@
   [{:keys [::bfc/embed-assets ::bfc/include-libraries] :as cfg} file-id]
 
   (when (and include-libraries embed-assets)
-    (throw (IllegalArgumentException.
-            "the `include-libraries` and `embed-assets` are mutally excluding options")))
+    (ex/raise :type :validation
+              :code :incompatible-options
+              :hint "the `include-libraries` and `embed-assets` are mutually exclusive options"))
 
   (let [detach? (and (not embed-assets) (not include-libraries))]
     (db/tx-run! cfg (fn [cfg]