fix: restore rich descriptions lost in auto-generation

- Snapshot flags: add back value hints (-d <N>, -s <sel>, -o <path>)
- Snapshot flags: restore parenthetical context (@e refs, @c refs, etc.)
- Commands: is → includes valid states enum
- Commands: console → notes --errors filter behavior
- Commands: press → lists common keys (Enter, Tab, Escape)
- Commands: cookie-import-browser → describes picker UI
- Commands: dialog-accept → specifies alert/confirm/prompt
- Tips: restore → arrow (was downgraded to ->)

scripts/gen-skill-docs.ts

@@ -63,10 +63,8 @@ function generateSnapshotFlags(): string {
   ];
 
   for (const flag of SNAPSHOT_FLAGS) {
-    const flagStr = flag.takesValue
-      ? `${flag.short.padEnd(10)}${flag.description}`
-      : `${flag.short.padEnd(10)}${flag.description}`;
-    lines.push(flagStr);
+    const label = flag.valueHint ? `${flag.short} ${flag.valueHint}` : flag.short;
+    lines.push(`${label.padEnd(10)}${flag.description}`);
   }
 
   lines.push('```');