Display workspace local file changes in expanded workspace list card

MR: Pending

Description

As part of our new designs for Workspaces, we need to add a file changes section to the expanded workspace cards so that users can quickly see which files have uncommitted changes and identify workspaces with unsaved work using the new changedFiles field from the workspace GraphQL type. This field was added in Add workspace file changes field definition and... (#565017) • Unassigned • Backlog

Visual Changes

Acceptance criteria

• Add "Changes" section to expanded workspace cards
• Show truncated list of changed file paths
• Include three-dot menu button for additional actions (expand file list)
• Handle cases with no file changes

TODO: Implementation plan