feat(tui): bare /details opens a keyboard selector

DetailsDialog is a centered SelectList over the five transcript-detail
states (three tool-card phases, reasoning shown/hidden); it preselects
the current phase, marks both current values, applies on Enter, and
cancels on Esc/Ctrl+C. Width is the new detailsDialogWidth config key.
The argument grammar is unchanged and shares the same setters.

docs/config-catalog.md

@@ -2034,6 +2034,8 @@ export interface TuiConfig {
   questionDialogMaxHeight?: number
   /** Model-selector width in terminal columns. */
   modelDialogWidth?: number
+  /** Transcript-details selector width in terminal columns. */
+  detailsDialogWidth?: number
   /** Model-selector maximum height in terminal rows. */
   modelDialogMaxHeight?: number
   /** Maximum fuzzy file candidates displayed for one `@` query. */
@@ -2067,7 +2069,7 @@ export interface TuiThemeConfig {
 }
 ```
 
-Source: [`packages/ui/tui/src/config.ts:117`](../packages/ui/tui/src/config.ts)
+Source: [`packages/ui/tui/src/config.ts:121`](../packages/ui/tui/src/config.ts)
 
 ## `@deepseek-ai/dsh-typert-loader`