feat: add performance controls for large browser ops

- Add throttled large-operation handling for tab, group, and session commands.
- Introduce performance profiles, audible-tab aware gentle mode, and job progress tracking.
- Support background session restores with status/cancel commands and lazy placeholders.
- Expose new perf and extension CLI groups plus matching Python SDK methods.
- Preserve pinned tabs during session snapshots and debounce auto-save updates.
- Bump browser-cli and extension versions to 0.10.0 and add pytest-cov to dev deps.
- Add coverage for performance controls, background jobs, lazy restores, and tab metadata.

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "browser-cli"
-version = "0.9.9"
+version = "0.10.0"
 description = "Control your real running browser from the terminal or Python SDK"
 requires-python = ">=3.10"
 dependencies = [
@@ -13,7 +13,10 @@ dependencies = [
 browser-cli = "browser_cli.cli:main"
 
 [dependency-groups]
-dev = ["pytest>=8"]
+dev = [
+    "pytest>=8",
+    "pytest-cov>=7.1.0",
+]
 
 [build-system]
 requires = ["hatchling"]