feat(tui): configurable custom home placeholders

[wyMinLwin]

Issue for this PR

Closes #

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Adds a placeholders field to tui.json so users can override
the rotating placeholder text inside the prompt input on the
home screen.

• placeholders.input replaces the normal-mode placeholder
  pool.
• placeholders.shell replaces the shell-mode placeholder
  pool.
• Items are used literally — when a user supplies their own
  array, the built-in Ask anything... "..." / Run a command... "..." framing is dropped so the strings show as-is.
  Without this the user's strings would still be wrapped in the
  prefix, which I didn't want for my own setup.
• Either field can be set independently; the other keeps its
  default. Omitting placeholders entirely keeps the existing
  behavior.

Why this works: the placeholder string is built in one place —
placeholderText in component/prompt/index.tsx — which
already reads the rotating index off
props.placeholders.normal/shell. I added two internal-only
flags (rawNormal, rawShell) on that same prop. When set,
placeholderText returns the rotated item literally instead of
wrapping it in the prefix. home.tsx is the only caller that
turns the flags on, and it does so based on whether the user
supplied an array. Existing random-pick rotation (on mount, on
session change, on entering shell mode) is preserved unchanged.

Files touched:

• packages/opencode/src/cli/cmd/tui/config/tui-schema.ts —
  schema entry.

packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx
— rawNormal / rawShell flags + branching in
placeholderText.

• packages/opencode/src/cli/cmd/tui/routes/home.tsx — reads
  useTuiConfig().placeholders and forwards arrays with the raw
  flags set.

How did you verify your code works?

Ran bunx tsgo --noEmit in packages/opencode and
packages/plugin — both clean.

Manually with bun run dev:

• No placeholders in tui.json → home shows Ask anything... "Fix broken tests" rotation as before.
• placeholders.input: ["foo", "bar"] → input rotates through
  foo / bar literally, no prefix.
• placeholders.shell: ["git status"] → entering shell mode
  with ! shows git status literally.
• Setting only input left shell on its default and vice
  versa.
• Single-item array always shows that item; multi-item picks
  randomly across new sessions.

Screenshots / recordings

Before:

Ask anything... "Fix broken tests"

After (tui.json):

{
  "$schema": "https://opencode.ai/tui.json",
  "placeholders": {
    "input": ["whatever I want here", "another literal"],
    "shell": ["git command?"]
  }
}

Renders:

whatever I want here

(no Ask anything... prefix, no quotes)

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

Hey! Your PR title tui: configurable custom home placeholders doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

[github-actions]

This PR doesn't fully meet our contributing guidelines and PR template.

What needs to be fixed:

• PR description is missing required template sections. Please use the PR template.

Please edit this PR description to address the above within 2 hours, or it will be automatically closed.

If you believe this was flagged incorrectly, please let a maintainer know.

[github-actions]

This pull request has been automatically closed because it was not updated to meet our contributing guidelines within the 2-hour window.

Feel free to open a new pull request that follows our guidelines.