Inject the corporate CA certificate into containers

Behind a TLS-terminating corporate proxy every HTTPS call inside a container
fails — npm, pip, git, curl, the browser-view pane, and Claude Code's own API
requests. There was no mechanism at all: installing the certificate by hand
inside a container is lost on Reset and had to be repeated per project.

A global CA path in AppSettings with a per-project override on Project, taking
either a single certificate file or a directory. It is bind-mounted read-only
at /tmp/.host-ca (mirroring /tmp/.host-ssh and /tmp/.host-aws) and applied by
entrypoint.sh on every start, so it survives recreation, migration and Reset.

Four things this gets right that are easy to get wrong:

* update-ca-certificates globs *.crt case-sensitively, so a .pem that is merely
  copied in is ignored in silence. Certificates are renamed, by
  container_cert_name() in Rust and a mirrored few lines of shell.
* The system store only serves curl/git/apt. Node — and so Claude Code itself —
  needs NODE_EXTRA_CA_CERTS, Python needs REQUESTS_CA_BUNDLE/SSL_CERT_FILE, and
  Chromium reads neither: it wants ~/.pki/nssdb, seeded with certutil
  (libnss3-tools, added to the image).
* Those vars are set from Rust at creation, never exported by the entrypoint —
  a terminal is a docker exec and sees nothing the entrypoint exported. They are
  emitted empty when no CA is configured, since docker commit bakes env into the
  snapshot image.
* triple-c.ca-fingerprint hashes the certificate bytes as well as the path, so
  a CA rotated in at the same location still forces a recreation.

Verified end to end against a real container and a self-signed CA: curl, node,
python and git all complete a TLS handshake against a server signed by it and
all three fail in the same container without it; the env vars are visible from
a docker exec session; the store is cleaned when the setting is cleared.

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

app/src-tauri/src/models/project.rs

@@ -166,6 +166,13 @@ pub struct Project {
     #[serde(default)]
     pub permission_mode: Option<PermissionMode>,
     pub ssh_key_path: Option<String>,
+    /// Per-project override for the corporate CA certificate path (file or
+    /// directory). Blank falls back to `AppSettings::ca_cert_path`.
+    ///
+    /// `#[serde(default)]` rather than a required field: every project stored
+    /// before this existed must keep loading.
+    #[serde(default)]
+    pub ca_cert_path: Option<String>,
     #[serde(skip_serializing, default)]
     pub git_token: Option<String>,
     pub git_user_name: Option<String>,
@@ -363,6 +370,7 @@ impl Project {
             full_permissions: false,
             permission_mode: None,
             ssh_key_path: None,
+            ca_cert_path: None,
             git_token: None,
             git_user_name: None,
             git_user_email: None,