feat: brainstorm sessions, PDF document Q&A, embedding fixes, and UI improvements

- Add brainstorm feature with collaborative canvas, AI idea generation, live cursors, playback, and export
- Add PDF upload/extraction/ingestion pipeline with pgvector document search (RAG)
- Add document Q&A overlay with streaming chat and PDF preview
- Add note attachments UI with status polling, grid layout, and auto-scroll
- Add task extraction AI tool and agent executor improvements
- Fix NoteEmbedding missing updatedAt column, re-index 66 notes with 1536-dim embeddings
- Fix brainstorm 'Create Note' button: add success toast and redirect to created note
- Fix memory echo notification infinite polling
- Fix chat route to always include document_search tool
- Add brainstorm i18n keys across all 14 locales
- Add socket server for real-time brainstorm collaboration
- Add hierarchical notebook selector and organize notebook dialog improvements
- Add sidebar brainstorm section with session management
- Update prisma schema with brainstorm tables, attachments, and document chunks

memento-note/app/globals.css

@@ -19,7 +19,7 @@
   --color-memento-ink: #1C1C1C;
   --color-primary: #ACB995;
   --color-memento-accent: #D4A373;
-  --color-memento-blue: #75B2D6;
+  --color-memento-blue: #A47148;
   --color-memento-paper-elevated: #faf9f5;
   --color-background-light: var(--color-memento-paper);
   --color-background-dark: #202020;
@@ -29,7 +29,7 @@
   --color-paper: var(--paper);
   --color-muted-ink: var(--muted-ink);
   --color-concrete: var(--concrete);
-  --color-blueprint: #75B2D6;
+  --color-blueprint: #A47148;
   --color-ochre: #D4A373;
   --color-sage: #A3B18A;
   --color-rust: #9B2226;
@@ -273,6 +273,13 @@ html.dark .sidebar-inbox-item.active {
   opacity: 0.7;
 }
 
+/* Persian/Arabic: avoid uppercase + wide tracking on mixed scripts; bidi class set in TSX */
+.note-date-badge.note-date-badge--locale-rtl {
+  text-transform: none;
+  letter-spacing: 0.08em;
+  unicode-bidi: isolate;
+}
+
 /* AI send button accent */
 .ai-send-btn {
   background: var(--ai-accent);
@@ -1181,7 +1188,7 @@ html.font-system * {
 .notion-editor-wrapper .ProseMirror p.is-editor-empty:first-child::before,
 .notion-editor-wrapper .ProseMirror p.is-empty::before {
   content: attr(data-placeholder);
-  float: left;
+  float: inline-start;
   color: var(--muted-foreground);
   pointer-events: none;
   height: 0;
@@ -1221,13 +1228,13 @@ html.font-system * {
 /* --- Lists --- */
 .notion-editor-wrapper .ProseMirror ul {
   list-style-type: disc;
-  padding-left: 1.5rem;
+  padding-inline-start: 1.5rem;
   margin: 0.25em 0;
 }
 
 .notion-editor-wrapper .ProseMirror ol {
   list-style-type: decimal;
-  padding-left: 1.5rem;
+  padding-inline-start: 1.5rem;
   margin: 0.25em 0;
 }
 
@@ -1243,7 +1250,7 @@ html.font-system * {
 /* --- Task / Todo List --- */
 .notion-editor-wrapper .ProseMirror ul[data-type="taskList"] {
   list-style: none;
-  padding-left: 0;
+  padding-inline-start: 0;
 }
 
 .notion-editor-wrapper .ProseMirror ul[data-type="taskList"] li {
@@ -1301,13 +1308,16 @@ html.font-system * {
 
 /* --- Blockquote --- */
 .notion-editor-wrapper .ProseMirror blockquote {
-  border-left: 3px solid var(--primary);
-  padding: 0.25em 0 0.25em 1em;
+  border-inline-start: 3px solid var(--primary);
+  padding-block: 0.25em;
+  padding-inline-start: 1em;
+  padding-inline-end: 0;
   margin: 0.4em 0;
   color: var(--muted-foreground);
   font-style: italic;
   background: oklch(0.5 0 0 / 0.03);
-  border-radius: 0 4px 4px 0;
+  border-start-end-radius: 4px;
+  border-end-end-radius: 4px;
 }
 
 /* --- Code --- */
@@ -1983,13 +1993,13 @@ html.font-system * {
 
 .rt-preview ul,
 .rt-preview ol {
-  padding-left: 1.25rem;
+  padding-inline-start: 1.25rem;
   margin: 0.2em 0;
 }
 
 .rt-preview blockquote {
-  border-left: 3px solid var(--border);
-  padding-left: 0.75rem;
+  border-inline-start: 3px solid var(--border);
+  padding-inline-start: 0.75rem;
   color: var(--muted-foreground);
   margin: 0.3em 0;
 }
@@ -2036,7 +2046,7 @@ html.font-system * {
 .fullpage-editor .ProseMirror ol {
   font-size: 1.125rem;
   line-height: 1.8;
-  padding-left: 1.5em;
+  padding-inline-start: 1.5em;
   margin-bottom: 1em;
 }
 
@@ -2045,8 +2055,8 @@ html.font-system * {
 }
 
 .fullpage-editor .ProseMirror blockquote {
-  border-left: 3px solid var(--foreground);
-  padding-left: 1.25rem;
+  border-inline-start: 3px solid var(--foreground);
+  padding-inline-start: 1.25rem;
   font-size: 1.2rem;
   font-style: italic;
   font-family: var(--font-memento-serif, Georgia, serif);
@@ -2058,7 +2068,7 @@ html.font-system * {
 .fullpage-editor .ProseMirror p.is-editor-empty:first-child::before {
   color: var(--muted-foreground);
   content: attr(data-placeholder);
-  float: left;
+  float: inline-start;
   height: 0;
   pointer-events: none;
   font-size: 1.125rem;