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>

skills/agent-browser/SKILL.md

@@ -61,7 +61,17 @@ agent-browser --state ./auth.json open https://app.example.com/dashboard
 
 State files contain session tokens in plaintext -- add to `.gitignore` and delete when no longer needed. Set `AGENT_BROWSER_ENCRYPTION_KEY` for encryption at rest.
 
-**Option 2: Persistent profile (simplest for recurring tasks)**
+**Option 2: Chrome profile reuse (zero setup)**
+
+```bash
+# List available Chrome profiles
+agent-browser profiles
+
+# Reuse the user's existing Chrome login state
+agent-browser --profile Default open https://gmail.com
+```
+
+**Option 3: Persistent profile (for recurring tasks)**
 
 ```bash
 # First run: login manually or via automation
@@ -72,7 +82,7 @@ agent-browser --profile ~/.myapp open https://app.example.com/login
 agent-browser --profile ~/.myapp open https://app.example.com/dashboard
 ```
 
-**Option 3: Session name (auto-save/restore cookies + localStorage)**
+**Option 4: Session name (auto-save/restore cookies + localStorage)**
 
 ```bash
 agent-browser --session-name myapp open https://app.example.com/login