Add Project Home, Auth Bridge, shared auth token, and Tier-1 polish

Project Home (DESIGN-REVIEW §B2): the project is promoted from a 280px
sidebar card to a first-class main-area view. ProjectCard.tsx (1,257
lines) is replaced by a select-only ProjectRow plus tabs for Overview,
Sessions, Automation, Config and Files. The PortMappings, FileManager
and ContainerProgress modals are absorbed rather than reimplemented.
Config gains a Saved/Saving/Failed indicator — save-on-blur failures
previously reached only console.error.

Tier-1 polish (DESIGN-REVIEW §A): new elevation, muted-accent, disabled
and focus-ring tokens; a global :focus-visible ring with every
focus:outline-none removed; filled buttons moved to --accent-emphasis
and white-on-success toggles retired, fixing three WCAG AA failures
(2.1:1, 2.5:1, 2.4:1); a shared Modal primitive with role="dialog",
focus trap and restore, adopted by all remaining modals; status
indicators that carry a glyph and word rather than colour alone.

Ctrl+Shift+W closes a tab, deliberately not Ctrl+W — that is readline's
kill-word, used constantly in the terminal this app is built around.

Auth Bridge: a general loopback-callback bridge so browser logins run
inside a container (aws sso login, Concourse fly login, claude login)
can complete against the host browser. Listeners are discovered from
/proc/net/tcp{,6} — ss/netstat/lsof are absent from the image — bound on
host 127.0.0.1 only, and tunnelled in over the Docker API via socat,
which keeps working on Docker Desktop where container IPs are not
routable. Falls back to [::1] because Node resolves localhost to IPv6
first, so claude login often binds ::1 alone. Opt-in per project.

This extracts create_attached_exec() and moves the existing terminal
session path onto it, so there is one attached-exec implementation
rather than two.

Shared auth token: `claude setup-token` is run in a container, the token
is stored in the OS keychain and injected as CLAUDE_CODE_OAUTH_TOKEN
into Anthropic-backend projects. Contrary to the initial design note,
setup-token uses an Anthropic-hosted redirect and blocks on a stdin
paste prompt rather than a loopback callback, so a stdin command is
required for the flow to complete.

The token is never logged, never returned to the frontend, and is
redacted from the streamed output with a stateful matcher that withholds
any tail that could still grow into a secret. Change detection uses a
random rotation id rather than a hash, since a hash in a docker-inspect
readable label would be an offline verification oracle.

Frontend 33 -> 51 tests; Rust 34 tests. Both builds clean.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

app/src/components/projects/home/config/RuntimeSection.tsx

@@ -0,0 +1,103 @@
+import type { Project } from "../../../../lib/types";
+import Toggle from "../../../ui/Toggle";
+import { ConfigGroup, SwitchRow } from "../../../ui/Field";
+import PermissionModeControl, { permissionModePatch } from "../../PermissionModeControl";
+import ClaudeInstructionsEditor from "../../ClaudeInstructionsEditor";
+import ClaudeCodeSettingsEditor from "../../ClaudeCodeSettingsEditor";
+
+interface Props {
+  project: Project;
+  save: (patch: Partial<Project>) => Promise<boolean>;
+  disabled: boolean;
+  disabledReason?: string;
+}
+
+export default function RuntimeSection({
+  project,
+  save,
+  disabled,
+  disabledReason,
+}: Props) {
+  return (
+    <>
+      <ConfigGroup
+        title="Runtime"
+        description="How much the sandbox lets Claude do, and what contains it."
+      >
+        <div className="pb-2 border-b border-[var(--border-color)]">
+          <PermissionModeControl
+            project={project}
+            onChange={(mode) => save(permissionModePatch(mode))}
+          />
+        </div>
+
+        <SwitchRow
+          label="Sandbox mode"
+          hint="Claude Code's bash sandbox (bubblewrap filesystem and network isolation). Triple-C is the source of truth: toggling this overrides any manual /sandbox configuration in the container's settings.json on next start."
+          control={
+            <Toggle
+              label="Sandbox mode"
+              checked={project.sandbox_mode_enabled}
+              disabled={disabled}
+              onChange={(v) => save({ sandbox_mode_enabled: v })}
+            />
+          }
+        />
+
+        <SwitchRow
+          label="Allow container spawning"
+          hint="Mounts the Docker socket so Claude can build and run Docker containers from inside the sandbox."
+          control={
+            <Toggle
+              label="Allow container spawning"
+              checked={project.allow_docker_access}
+              disabled={disabled}
+              onChange={(v) => save({ allow_docker_access: v })}
+            />
+          }
+        />
+
+        <SwitchRow
+          label="Mission Control"
+          hint="A web dashboard for monitoring and managing Claude sessions remotely."
+          control={
+            <Toggle
+              label="Mission Control"
+              checked={project.mission_control_enabled}
+              disabled={disabled}
+              onChange={(v) => save({ mission_control_enabled: v })}
+            />
+          }
+        />
+
+        {disabled && disabledReason && (
+          <p className="text-xs text-[var(--text-disabled)]">{disabledReason}</p>
+        )}
+      </ConfigGroup>
+
+      <ConfigGroup
+        title="Claude instructions"
+        description="Written to ~/.claude/CLAUDE.md inside this project's container."
+      >
+        <ClaudeInstructionsEditor
+          instructions={project.claude_instructions ?? ""}
+          disabled={disabled}
+          disabledReason={disabledReason}
+          onSave={(value) => save({ claude_instructions: value || null })}
+        />
+      </ConfigGroup>
+
+      <ConfigGroup
+        title="Claude Code settings"
+        description="Per-project CLI behaviour. These override the global defaults in Settings."
+      >
+        <ClaudeCodeSettingsEditor
+          settings={project.claude_code_settings}
+          disabled={disabled}
+          disabledReason={disabledReason}
+          onSave={(settings) => save({ claude_code_settings: settings })}
+        />
+      </ConfigGroup>
+    </>
+  );
+}