feat: reuse Chrome profile login state via --profile <name> (#1131)

* feat(chrome): add Chrome profile name resolution and copy for --profile flag

When --profile receives a name without path separators (e.g., "Default"),
it now resolves the name against installed Chrome profiles, copies the
profile to a temp directory (excluding large cache dirs), and launches
Chrome with the copied profile to reuse login state.

Key changes:
- Add profile resolution: is_chrome_profile_name, find_chrome_user_data_dir,
  list_chrome_profiles, resolve_chrome_profile (3-tier matching)
- Add copy_chrome_profile with best-effort copy and exclusion list
- Wire preprocessing into launch_chrome before retry loop
- Add use_real_keychain field to LaunchOptions for conditional keychain flags
- Make --password-store=basic and --use-mock-keychain conditional

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat(cli): add `profiles` command to list available Chrome profiles

Adds `agent-browser profiles` command that reads Chrome's Local State
file to list available profiles with directory names and display names.
Supports --json output. Added help text in print_command_help and
print_help.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* docs: add Chrome profile reuse documentation across all locations

Update all 5 documentation locations per AGENTS.md:
- output.rs: updated --profile help text and examples
- README.md: added Chrome Profile Reuse section, updated options table
- SKILL.md: added profile reuse as Option 2
- docs/src/app/sessions/page.mdx: added Chrome profile reuse section
- chrome.rs: added doc comments to get_chrome_user_data_dirs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* style: fix formatting and clippy warning in chrome.rs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* refactor: simplify profile resolution and launch integration

- Only clone LaunchOptions when profile name requires resolution
  (avoids unnecessary allocation on every Chrome launch)
- Remove redundant is_file() check before copy of Local State
  (copy() handles missing files naturally)
- Extract format_profile_list() to deduplicate error formatting
- Remove unnecessary section comments in tests

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* refactor(tests): use RAII TempDir guard for test cleanup

Replace manual remove_dir_all calls with a TempDir struct that
auto-cleans on drop, preventing temp dir leaks on test panics.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: ctate <366502+ctate@users.noreply.github.com>

cli/src/output.rs

@@ -2652,6 +2652,26 @@ Examples:
 "##
         }
 
+        "profiles" => {
+            r##"
+agent-browser profiles - List available Chrome profiles
+
+Usage: agent-browser profiles
+
+Lists all Chrome profiles found in your Chrome user data directory, showing
+the directory name and display name for each profile. Use the directory name
+with --profile to launch Chrome with that profile's login state.
+
+Global Options:
+  --json               Output as JSON
+
+Examples:
+  agent-browser profiles
+  agent-browser profiles --json
+  agent-browser --profile Default open https://gmail.com
+"##
+        }
+
         _ => return false,
     };
     println!("{}", help.trim());
@@ -2777,6 +2797,7 @@ Setup:
   install --with-deps        Also install system dependencies (Linux)
   upgrade                    Upgrade to the latest version
   dashboard install          Install the observability dashboard
+  profiles                   List available Chrome profiles
 
 Snapshot Options:
   -i, --interactive          Only interactive elements
@@ -2785,7 +2806,8 @@ Snapshot Options:
   -s, --selector <sel>       Scope to CSS selector
 
 Authentication:
-  --profile <path>           Persist login sessions across restarts (cookies, IndexedDB, cache)
+  --profile <name|path>      Chrome profile name (e.g., Default) to reuse login state,
+                             or a directory path for a persistent custom profile
                              (or AGENT_BROWSER_PROFILE env)
   --session-name <name>      Auto-save/restore cookies and localStorage by name
                              (or AGENT_BROWSER_SESSION_NAME env)
@@ -2912,7 +2934,9 @@ Examples:
   agent-browser stream enable            # Start runtime streaming on an auto-selected port
   agent-browser stream status            # Inspect runtime streaming state
   agent-browser --color-scheme dark open example.com  # Dark mode
-  agent-browser --profile ~/.myapp open example.com    # Persistent profile
+  agent-browser --profile Default open gmail.com        # Reuse Chrome login state
+  agent-browser --profile ~/.myapp open example.com    # Persistent custom profile
+  agent-browser profiles                               # List available Chrome profiles
   agent-browser --session-name myapp open example.com  # Auto-save/restore state
 
 Command Chaining: