feat(ui): redesign context and compression UI for a more seamless experience

- Added ui.showContextWindowWarning setting (default false).
- Implemented forced auto-compression on context overflow when warning is disabled.
- Redesigned compression messages to be subtle (gray, no icon, left border).
- Removed automatic context usage percentage from the minimal/focus UI.
- Changed ui.hideContextSummary default to true.
- Updated and verified all relevant tests.

Note: Includes a behavioral change where the CLI now attempts to force-compress
history when the context window is full rather than blocking by default.

packages/cli/src/ui/commands/compressCommand.ts

@@ -33,6 +33,7 @@ export const compressCommand: SlashCommand = {
         originalTokenCount: null,
         newTokenCount: null,
         compressionStatus: null,
+        model: context.services.config?.getModel(),
       },
     };
 
@@ -53,6 +54,7 @@ export const compressCommand: SlashCommand = {
               originalTokenCount: compressed.originalTokenCount,
               newTokenCount: compressed.newTokenCount,
               compressionStatus: compressed.compressionStatus,
+              model: context.services.config?.getModel(),
             },
           } as HistoryItemCompression,
           Date.now(),