Docs: document missing flags --force and --refresh-shared-infra (#3179)

* Docs: document missing flags --force and --refresh-shared-infra

Fixes #3177

* Address review: Reorder flags to match CLI help output

Author: DyanGalih

docs/reference/extensions.md

@@ -26,6 +26,7 @@ specify extension add <name>
 | --------------- | -------------------------------------------------------- |
 | `--dev`         | Install from a local directory (for development)         |
 | `--from <url>`  | Install from a custom URL instead of the catalog         |
+| `--force`       | Overwrite if already installed                           |
 | `--priority <N>`| Resolution priority (default: 10; lower = higher precedence) |
 
 Installs an extension from the catalog, a URL, or a local directory. Extension commands are automatically registered with the currently installed AI coding agent integration.

docs/reference/integrations.md

@@ -100,6 +100,7 @@ specify integration switch <key>
 | ------------------------ | ------------------------------------------------------------------------ |
 | `--script sh\|ps`        | Script type: `sh` (bash/zsh) or `ps` (PowerShell)                        |
 | `--force`                | Force removal of modified files during uninstall; when the target is already installed, overwrite managed shared templates while changing the default |
+| `--refresh-shared-infra` | Also overwrite shared infrastructure files even if you customized them (otherwise customizations are preserved) |
 | `--integration-options`  | Options for the target integration when it is not already installed      |
 
 If the target integration is not already installed, equivalent to running `uninstall` followed by `install` in a single step. In this mode, `--force` controls whether modified files from the removed integration are deleted. If the target integration is already installed, `switch` only changes the default integration, like `use`; in this mode, `--force` controls whether managed shared templates are overwritten while the default changes. `--integration-options` is rejected for already-installed targets because changing integration options requires reinstalling managed files; run `upgrade <key> --integration-options ...` first, then `use <key>`.