tui: "Invalid storage segment" crash when branch/channel name contains "/"

Description

The TUI crashes immediately on startup with TypeError: Invalid storage segment: <channel> whenever the build's channel (the git branch name) contains a /. Common branch conventions like fix/..., feature/..., bugfix/... all trigger it.

Root cause is in packages/tui/src/context/storage.tsx. createStorage(root, channel) runs the channel through segment():

function segment(value: string) {
  if (!/^[a-zA-Z0-9][a-zA-Z0-9._-]*$/.test(value) || value === "." || value === "..")
    throw new TypeError(`Invalid storage segment: ${value}`)
  return value
}

The regex rejects /, so a channel derived from a slash-containing branch name throws during StorageProvider initialization, before the TUI renders anything.

Suggested fix: sanitize the channel before segment() (e.g. replace / with -), or allow / in the segment regex. Branch names with slashes are ubiquitous, so the channel-as-segment path needs to tolerate them.

Plugins

@mohak34/opencode-notifier, @nick-vi/opencode-type-inject, oh-my-openagent, opencode-gemini-auth, opencode-openai-codex-auth, opencode-wakatime

OpenCode version

0.0.0-fix/v2-titlebarright-provider-202608261819 (channel: fix/v2-titlebarright-provider)

Steps to reproduce

1. Build opencode from a branch whose name contains / (e.g. fix/v2-titlebarright-provider), so the channel becomes the branch name.
2. Launch the TUI (opencode).
3. It crashes at startup before rendering.

Minimal repro: git checkout -b x/y → build & run opencode.

Expected behavior

The TUI starts normally regardless of branch name.

Actual behavior

TypeError: Invalid storage segment: fix/v2-titlebarright-provider
    at PA (/usr/lib/root/chunk-0k3rjw2z.js:2692:2514)
    at YFt (/usr/lib/root/chunk-0k3rjw2z.js:2692:2623)
    at oQ (/usr/lib/root/chunk-0k3rjw2z.js:2692:3622)
    at Z (/usr/lib/root/chunk-kxae28wy.js:2:7204)
    at <anonymous> (/usr/lib/root/chunk-0k3rjw2z.js:2590:3395)
    at <anonymous> (/usr/lib/root/chunk-kxae28wy.js:2:14690)
    at pA (/usr/lib/root/chunk-kxae28wy.js:2:10199)
    at fe (/usr/lib/root/chunk-kxae28wy.js:2:9980)
    at E (/usr/lib/root/chunk-kxae28wy.js:2:4528)
    at xe (/usr/lib/root/chunk-kxae28wy.js:2:8496)

Operating System

macOS 25.6.0 (arm64)

Terminal

xterm-256color