feat(app): redesign attachment cards (#35945)

Co-authored-by: Brendan Allan <git@brendonovich.dev>
Co-authored-by: Brendan Allan <14191578+Brendonovich@users.noreply.github.com>

packages/session-ui/src/v2/components/attachment-card-v2.css

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+[data-component="attachment-card-v2"] {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  box-sizing: border-box;
+  width: 160px;
+  min-width: 160px;
+  max-width: 160px;
+  padding: 8px;
+  border-radius: 6px;
+  background: var(--v2-overlay-simple-overlay-hover);
+  box-shadow: inset 0 0 0 0.5px var(--v2-border-border-base);
+  cursor: default;
+
+  &[data-active] {
+    box-shadow: inset 0 0 0 0.5px var(--v2-border-border-strong);
+  }
+
+  &[data-clickable] {
+    cursor: pointer;
+  }
+
+  [data-slot="attachment-card-v2-title"],
+  [data-slot="attachment-card-v2-subtitle"] {
+    max-width: 100%;
+    font-family: var(--v2-font-family-sans, "Inter", sans-serif);
+    font-style: normal;
+    font-size: 11px;
+    line-height: 12px;
+    letter-spacing: 0.05px;
+    font-variation-settings: "slnt" 0;
+  }
+
+  [data-slot="attachment-card-v2-title"] {
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+    font-weight: 530;
+    color: var(--v2-text-text-base);
+  }
+
+  [data-slot="attachment-card-v2-subtitle"] {
+    display: flex;
+    align-items: center;
+    gap: 4px;
+    min-width: 0;
+    overflow: hidden;
+    white-space: nowrap;
+    font-weight: 440;
+    color: var(--v2-text-text-muted);
+
+    [data-component="file-icon"] {
+      width: 12px;
+      height: 12px;
+      flex: none;
+    }
+  }
+}

packages/session-ui/src/v2/components/attachment-card-v2.tsx

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+import type { JSX } from "solid-js"
+import "./attachment-card-v2.css"
+
+/** Shared 160px two-line card used by v2 file and comment attachments in the composer and timeline. */
+export function AttachmentCardV2(props: {
+  title: string
+  active?: boolean
+  clickable?: boolean
+  /** native title attribute */
+  hover?: string
+  onClick?: () => void
+  children: JSX.Element
+}) {
+  return (
+    <div
+      data-component="attachment-card-v2"
+      data-active={props.active ? "true" : undefined}
+      data-clickable={props.clickable ? "true" : undefined}
+      title={props.hover}
+      onClick={() => props.onClick?.()}
+    >
+      <span data-slot="attachment-card-v2-title">{props.title}</span>
+      <span data-slot="attachment-card-v2-subtitle">{props.children}</span>
+    </div>
+  )
+}

packages/session-ui/src/v2/components/comment-card-v2.tsx

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+import { Show } from "solid-js"
+import { FileIcon } from "@opencode-ai/ui/file-icon"
+import { getFilenameTruncated } from "@opencode-ai/core/util/path"
+import { AttachmentCardV2 } from "./attachment-card-v2"
+
+export function CommentCardV2(props: {
+  comment: string
+  path: string
+  selection?: { startLine: number; endLine: number }
+  active?: boolean
+  title?: string
+  onClick?: () => void
+}) {
+  return (
+    <AttachmentCardV2 title={props.comment} active={props.active} hover={props.title} onClick={props.onClick}>
+      <FileIcon node={{ path: props.path, type: "file" }} />
+      <span>
+        {getFilenameTruncated(props.path, 14)}
+        <Show when={props.selection}>
+          {(sel) =>
+            sel().startLine === sel().endLine ? `:${sel().startLine}` : `:${sel().startLine}-${sel().endLine}`
+          }
+        </Show>
+      </span>
+    </AttachmentCardV2>
+  )
+}