UX: Improve video generation validation feedback (#965)

**UX: Improve video generation validation feedback**

- Enable "Generate" button interactions to provide actionable error
toasts instead of silent disabling.
- Add inline "Starting frame required" warning with icon when a
reference image is missing.
- Update tooltip component to support conditional disabling for better
UX control.

frontend/libs/components/promptbox/src/lib/PromptBoxVideo.tsx

@@ -17,6 +17,7 @@ import {
   faSpinnerThird,
   faWaveformLines,
 } from "@fortawesome/pro-solid-svg-icons";
+import {faCircleInfo} from  "@fortawesome/pro-regular-svg-icons";
 import {
   faRectangle,
   faSquare,
@@ -249,12 +250,13 @@ export const PromptBoxVideo = ({
 
     if (!selectedModel) {
       console.warn("Cannot generate video: no model selected");
+      toast.error("Please select a model to generate video");
       return;
     }
 
     if (selectedModel?.requiresImage && referenceImages.length === 0) {
       console.warn("Cannot generate video: no reference image provided");
-      toast.error("Please choose a starting frame image to generate video");
+      toast.error("Please add a starting frame image to generate video");
       return;
     }
 
@@ -393,7 +395,7 @@ export const PromptBoxVideo = ({
                 <img
                   src={image.url}
                   alt="Reference preview"
-                  className="w-full h-full object-contain"
+                  className="h-full w-full object-contain"
                 />,
               );
               setIsModalOpen(true);
@@ -517,26 +519,37 @@ export const PromptBoxVideo = ({
               )}
             </div>
             <div className="flex items-center gap-2">
-              <Button
-                className="flex items-center border-none bg-primary px-3 text-sm text-white disabled:cursor-not-allowed disabled:opacity-50"
-                icon={!isEnqueueing ? faSparkles : undefined}
-                onClick={handleEnqueue}
-                disabled={
-                  isEnqueueing ||
-                  !prompt.trim() ||
-                  modelNeedsAnImageButNoneAreSelected ||
-                  !selectedModel
-                }
+              {modelNeedsAnImageButNoneAreSelected && (
+                <span className="flex items-center gap-1.5 text-xs text-red-500 font-medium animate-pulse">
+                  <FontAwesomeIcon icon={faCircleInfo} />
+                  Starting frame required
+                </span>
+              )}
+              <Tooltip
+                content="Add a starting image before generating"
+                position="top"
+                className="z-50"
+                delay={0}
+                disabled={!modelNeedsAnImageButNoneAreSelected}
               >
-                {isEnqueueing ? (
-                  <FontAwesomeIcon
-                    icon={faSpinnerThird}
-                    className="animate-spin text-lg"
-                  />
-                ) : (
-                  "Generate"
-                )}
-              </Button>
+                <div>
+                  <Button
+                    className="flex items-center border-none bg-primary px-3 text-sm text-white disabled:cursor-not-allowed disabled:opacity-50"
+                    icon={!isEnqueueing ? faSparkles : undefined}
+                    onClick={handleEnqueue}
+                    disabled={isEnqueueing || !prompt.trim()}
+                  >
+                    {isEnqueueing ? (
+                      <FontAwesomeIcon
+                        icon={faSpinnerThird}
+                        className="animate-spin text-lg"
+                      />
+                    ) : (
+                      "Generate"
+                    )}
+                  </Button>
+                </div>
+              </Tooltip>
             </div>
           </div>
         </div>

frontend/libs/components/tooltip/src/lib/tooltip.tsx

@@ -18,6 +18,7 @@ interface TooltipProps {
   interactive?: boolean;
   onOpenChange?: (open: boolean) => void;
   zIndex?: number;
+  disabled?: boolean;
 }
 
 export const Tooltip = ({
@@ -32,6 +33,7 @@ export const Tooltip = ({
   interactive = false,
   onOpenChange,
   zIndex = 10,
+  disabled = false,
 }: TooltipProps) => {
   const [isShowing, setIsShowing] = useState(false);
   const triggerRef = useRef<HTMLDivElement>(null);
@@ -118,13 +120,17 @@ export const Tooltip = ({
   };
 
   useEffect(() => {
+    if (disabled) {
+      setIsShowing(false);
+      return;
+    }
     if (!checkForOpenPopovers()) {
       const shouldShow =
         isHoveringTrigger || (interactive && isHoveringTooltip);
       setIsShowing(shouldShow);
     }
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [isHoveringTrigger, isHoveringTooltip, interactive]);
+  }, [isHoveringTrigger, isHoveringTooltip, interactive, disabled]);
 
   useEffect(() => {
     onOpenChange?.(isShowing);
@@ -135,7 +141,7 @@ export const Tooltip = ({
       ref={triggerRef}
       onMouseEnter={() => {
         setIsHoveringTrigger(true);
-        if (!checkForOpenPopovers()) {
+        if (!checkForOpenPopovers() && !disabled) {
           setIsShowing(true);
         }
       }}