Browser view: find every Playwright, and set one up in two clicks

Detection missed the npx cache, so a Playwright installed through Claude
Code's MCP setup (`npx @playwright/mcp@latest`, which unpacks into
~/.npm/_npx/<hash>/node_modules and no node_modules at all) was invisible.
The probe now globs that cache alongside the existing roots and reports
every root it consulted.

It also read `has_bind` off whichever manifest resolved first. Verified
that npm does not hoist for global installs and that the `playwright`
wrapper ships no types/types.d.ts, so `npm i -g playwright` made the pane
call a current build "predates browser.bind()". The probe now hops from
the wrapper to its nested playwright-core.

The messages no longer offer `@playwright/mcp` as a way through setup: it
bundles a playwright-core that binds but never `@playwright/cli`, so that
route could not have worked. It is named only for what it does do.

New `install.rs` + two commands do the setup, streaming on the existing
`container-progress` event and re-probing on success:

  * playwright + @playwright/cli into /workspace as `claude`, --no-save.
    /workspace is not a bind mount (projects mount at
    /workspace/{mount_name}), so nothing of the user's is touched, no sudo
    is needed, and Node resolves it from scripts in the project.
  * A browser, as its own action with the size stated first: apt libraries
    as root, then the download, then a real headless launch to prove it
    works. The base image ships none of Chromium's shared libraries, which
    is why a download could succeed and the browser still not start.
    Chromium and the Chrome channel are both offered — @playwright/mcp
    asks for `chrome` specifically. A certificate failure is reported as a
    container trust-store problem rather than a broken install.

Installing is always user-initiated; opening the tab only probes.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KSP2KNPhuWKQ4DL5TZEn3k

app/src-tauri/src/lib.rs

@@ -426,6 +426,8 @@ pub fn run() {
             browser_view::commands::set_browser_view_enabled,
             browser_view::commands::get_browser_view_status,
             browser_view::commands::check_browser_view_support,
+            browser_view::commands::install_browser_view_support,
+            browser_view::commands::install_browser_view_browser,
             // Shared Claude Code auth token
             commands::auth_token_commands::acquire_claude_token,
             commands::auth_token_commands::submit_claude_token_code,