feat(tui): show a banner in empty sessions

DIVERGENCES.md

@@ -37,6 +37,8 @@ upstream maintainers — see README → Syncing with upstream for why and how.
 | `packages/tui/src/feature-plugins/sidebar/footer.tsx` | Sidebar footer wordmark: upstream's two-tone "Open"+"Code" spans → a single "CoDev" span (text color, bold) | Upstream splits the wordmark across two spans, so it never matched `opencode` greps and survived earlier rebrand passes. | Keep our span; take upstream's surrounding changes. |
 | `packages/opencode/src/cli/cmd/*.ts` (tui, run, serve, attach, pr, upgrade, uninstall, web) | Help `describe` strings "opencode" → "codev" | `--help` is the first thing users read. | Keep our strings. |
 | `packages/tui/src/app.tsx` | Terminal title "OpenCode"/"OC \|" → "CoDev Code"/"CC \|"; startup dialog effect gates on `!useConnected()` (not `provider.length === 0` — hosted Zen free models always register) and opens the fork's `DialogConfigure` (component/dialog-configure.tsx, new file); added the `codev.configure` command (`/configure`) and a `CODEV_CONFIGURE=1` mount hook for `codev configure`; home screen skipped — plain startup seeds the `dummy` session route and auto-opens a new empty session (reusing a leftover default-titled empty one via `openNewSession`/`findEmptySession`), `session.new` and the current-session `session.deleted` handler open a new session instead of navigating home, and the `-c` resolver prefers non-default-titled sessions so it lands on the last real conversation | Tab title branding; first-run setup routes to the CoDev gateway configure flow (upstream's `/connect` stays as the escape hatch); `codev` starts directly in the session layout instead of the home screen. | Keep our strings, gate condition, dialog swap + command block, route seed, `openNewSession`/`findEmptySession` + call sites, and the `-c` default-title filter; take upstream's surrounding changes. |
+| `packages/tui/src/routes/session/index.tsx` | Empty-session banner: when the session has no messages, the transcript area shows the vertically centered `Logo` wordmark with the `home_bottom` tips slot beneath it (flexGrow spacer boxes), the session `Prompt` gets home's `placeholder` pool so the input shows an `Ask anything... "<suggestion>"` placeholder like home, and the scrollbox is clamped to `maxHeight` 1 until the first message (it holds its flex-derived height even when empty, so `flexGrow` 0 alone does not collapse it) | Startup lands in an empty session instead of the home screen; without this the transcript is a large blank void above the prompt. | Keep our banner block, the `placeholders` prop, and the conditional `maxHeight`; take upstream's surrounding changes. |
+| `packages/tui/src/routes/home.tsx` | `placeholder` suggestion pool exported (was module-private) | The empty-session view in routes/session/index.tsx feeds the same pool to its prompt, so upstream edits to the suggestions flow through. | Keep the `export` keyword; take upstream's changes to the list. |
 | `packages/tui/src/routes/session/permission.tsx`, `packages/opencode/src/cli/cmd/run/permission.shared.ts`, `packages/opencode/test/cli/run/permission.shared.test.ts`, `packages/tui/src/component/error-component.tsx`, `packages/opencode/src/cli/cmd/run/splash.ts` | Visible sentences/badges "OpenCode"/"opencode" → "CoDev Code"/"codev-code" (incl. the permission always-allow copy and its test expectations) | User-facing copy. | Keep our strings. |
 | `packages/opencode/src/installation/index.ts` | Updater detects/queries/installs `codev-code` (npm-family); GitHub fallback → quickbeard/codev-code | `codev-code upgrade` and the update notification target OUR npm package, never stock opencode. brew/choco/scoop probes never match (no such packages). | Keep our package names. |
 | `packages/opencode/src/config/config.ts` | `share` defaults to `"disabled"` when unset | Sharing publishes sessions to upstream's share service; internal users must opt in via config. | Keep our default block. |

packages/tui/src/routes/home.tsx

@@ -14,7 +14,8 @@ import { useTuiConfig } from "../config"
 import { HomeSessionDestinationProvider } from "./home/session-destination"
 
 let once = false
-const placeholder = {
+// Fork: also feeds the empty-session prompt in routes/session/index.tsx.
+export const placeholder = {
   normal: ["Fix a TODO in the codebase", "What is the tech stack of this project?", "Fix broken tests"],
   shell: ["ls -la", "git status", "pwd"],
 }

packages/tui/src/routes/session/index.tsx

@@ -53,6 +53,8 @@ import { DialogConfirm } from "../../ui/dialog-confirm"
 import { DialogTimeline } from "./dialog-timeline"
 import { DialogForkFromTimeline } from "./dialog-fork-from-timeline"
 import { DialogSessionRename } from "../../component/dialog-session-rename"
+import { Logo } from "../../component/logo"
+import { placeholder } from "../home"
 import { Sidebar } from "./sidebar"
 import { SubagentFooter } from "./subagent-footer.tsx"
 import { filetype } from "../../util/filetype"
@@ -1165,6 +1167,17 @@ export function Session() {
         <box flexDirection="row" flexGrow={1} minHeight={0}>
           <box flexGrow={1} minHeight={0} paddingBottom={1} paddingLeft={2} paddingRight={2} gap={1}>
             <Show when={session()}>
+              {/* Fork: startup lands in an empty session instead of the home
+                  screen, so fill the transcript void with a home-like banner
+                  until the first message arrives. */}
+              <Show when={messages().length === 0}>
+                <box flexGrow={1} minHeight={0} />
+                <box flexShrink={0} alignItems="center" gap={1}>
+                  <Logo />
+                  <pluginRuntime.Slot name="home_bottom" />
+                </box>
+                <box flexGrow={1} minHeight={0} />
+              </Show>
               <scrollbox
                 ref={(r) => (scroll = r)}
                 viewportOptions={{
@@ -1181,6 +1194,9 @@ export function Session() {
                 stickyScroll={true}
                 stickyStart="bottom"
                 flexGrow={1}
+                // The scrollbox holds its flex-derived height even when empty,
+                // so clamp it while the banner is shown.
+                maxHeight={messages().length === 0 ? 1 : undefined}
                 scrollAcceleration={scrollAcceleration()}
               >
                 <box height={1} />
@@ -1312,6 +1328,7 @@ export function Session() {
                       onSubmit={() => {
                         toBottom()
                       }}
+                      placeholders={messages().length === 0 ? placeholder : undefined}
                       sessionID={route.sessionID}
                       right={<pluginRuntime.Slot name="session_prompt_right" session_id={route.sessionID} />}
                     />