feat(ai-assistant): odt support, document-to-lesson attach, upload UX fixes

- Add .odt (application/vnd.oasis.opendocument.text) as a supported upload
  format; extract text via JSZip + content.xml parsing
- Add attach_document_to_lesson agent tool so the AI can attach an uploaded
  document to a lesson as a downloadable material
- Instruct the agent to create a "Course Materials" lesson (first lesson of
  the first section) and attach the uploaded document to it on implementation
- Suppress hallucinated references: uploaded documents do not count as fetched
  URLs — omit the References section when no fetch_documentation_url calls
  were made
- Surface specific upload error snackbars (file_too_large, unsupported_file_type)
  instead of silently logging; fix generic fallback message
- Allow typing in the chat textarea while a document is uploading; only block
  Enter/send, not the whole input
- Fix retry endpoint to return the current run instead of erroring when the run
  is already active (queued/running/waiting_for_input/paused)
- Connect @cio/core Redis singleton in the jobs bootstrap so course-generation
  workers no longer fail with "The client is closed"
- Expose documentAssets (assetId + fileName) alongside documentText in
  AgentContext and pass it through both the chat route and course runner

apps/dashboard/src/lib/features/ai-assistant/api/ai-assistant.svelte.ts

@@ -1,4 +1,6 @@
 import { BaseApiWithErrors, classroomio, apiClient, getRequestBaseUrl } from '$lib/utils/services/api';
+import { snackbar } from '$features/ui/snackbar/store';
+import { t } from '$lib/utils/functions/translations';
 import type {
   AgentConversation,
   AgentConversationCreateData,
@@ -158,7 +160,25 @@ class AiAssistantApi extends BaseApiWithErrors {
       }
     } catch (error) {
       console.error('Error uploading document:', error);
-      this.error = 'Failed to upload document';
+
+      let errorCode: string | null = null;
+
+      if (error instanceof Error) {
+        try {
+          const body = JSON.parse(error.message) as { error?: string };
+          errorCode = body.error ?? null;
+        } catch {
+          // message was not JSON
+        }
+      }
+
+      if (errorCode === 'file_too_large') {
+        snackbar.error(t.get('ai_assistant.upload_error_file_too_large'));
+      } else if (errorCode === 'unsupported_file_type') {
+        snackbar.error(t.get('ai_assistant.upload_error_unsupported_type'));
+      } else {
+        snackbar.error(t.get('ai_assistant.upload_error_generic'));
+      }
     }
 
     return null;

apps/dashboard/src/lib/features/ai-assistant/chat-input.svelte

@@ -175,7 +175,7 @@
 <input
   bind:this={fileInputEl}
   type="file"
-  accept=".pdf,.docx,.pptx,application/pdf,application/vnd.openxmlformats-officedocument.wordprocessingml.document,application/vnd.openxmlformats-officedocument.presentationml.presentation"
+  accept=".pdf,.docx,.pptx,.odt,application/pdf,application/vnd.openxmlformats-officedocument.wordprocessingml.document,application/vnd.openxmlformats-officedocument.presentationml.presentation,application/vnd.oasis.opendocument.text"
   class="hidden"
   onchange={handleFileChange}
 />
@@ -255,9 +255,9 @@
           bind:ref={chatTextareaRef}
           bind:value={inputValue}
           {mentionItems}
-          onSubmit={onSend}
+          onSubmit={isUploading ? undefined : onSend}
           placeholder={$t('ai_assistant.input_placeholder')}
-          disabled={isStreaming || isUploading}
+          disabled={isStreaming}
           typeLabel={getTypeLabel}
           emptyMessage={t.get('ai_assistant.mention_no_results')}
           rows={2}

apps/dashboard/src/lib/features/ai-assistant/message-bubble.svelte

@@ -151,7 +151,7 @@
             ? 'bg-white/15 text-white/90'
             : 'ui:bg-background/70 ui:text-muted-foreground'}"
         >
-          <FileTextIcon size={12} class="shrink-0" />
+          <FileTextIcon size={12} class="custom shrink-0" />
           <span class="min-w-0 truncate">{messageAttachment.name}</span>
         </div>
       {/if}

apps/dashboard/src/lib/features/ai-assistant/plan-view.svelte

@@ -5,6 +5,7 @@
   import FileQuestionIcon from '@lucide/svelte/icons/file-question';
   import PencilIcon from '@lucide/svelte/icons/pencil';
   import ArrowUpIcon from '@lucide/svelte/icons/arrow-up';
+  import LoaderIcon from '@lucide/svelte/icons/loader';
   import { Button } from '@cio/ui/base/button';
   import { Textarea } from '@cio/ui/base/textarea';
   import { SvelteSet } from 'svelte/reactivity';
@@ -53,6 +54,12 @@
     isExpanded = !defaultCollapsed;
   });
 
+  let isImplementing = $state(false);
+
+  $effect(() => {
+    if (isBusy) isImplementing = false;
+  });
+
   let changeRequest = $state('');
   const canSendChange = $derived(!isBusy && changeRequest.trim().length > 0);
 
@@ -301,7 +308,18 @@
       {/if}
 
       <div class="flex flex-col gap-2">
-        <Button size="sm" onclick={() => onImplement(editablePlan)} class="w-full">
+        <Button
+          size="sm"
+          disabled={isImplementing || isBusy}
+          onclick={() => {
+            isImplementing = true;
+            onImplement(editablePlan);
+          }}
+          class="w-full"
+        >
+          {#if isImplementing || isBusy}
+            <LoaderIcon size={14} class="animate-spin" />
+          {/if}
           {$t('ai_assistant.plan_implement')}
         </Button>
         <div class="flex items-end gap-2">