Move GLM 5.2 to 5.3

GLM 5.3 supersedes 5.2, so every reference to the older id follows it: the zai
preset's opus, sonnet and fable tiers, and the fable tier of `default`, which
routes to the same model through OpenRouter.

Also the hardcoded Z.AI entries in both builds' model pickers, which are the one
place a model id is not read from a preset - leaving those would have gone on
offering a superseded model from the menu while the presets used the new one.

haiku stays on glm-4.7: that is the fast/cheap tier, not a 5.x.

linux/claude-mode

@@ -1169,7 +1169,7 @@ cmd_models() {
             ;;
         zai)
             head_ 'Z.AI GLM models (from Z.AI docs - no public catalogue endpoint)'
-            say 'glm-5.2  - flagship coding model (opus/sonnet tier)'
+            say 'glm-5.3  - flagship coding model (opus/sonnet tier)'
             say 'glm-4.7  - fast/cheap tier (haiku tier)'
             ;;
         *)
@@ -1620,7 +1620,7 @@ ui_pick_model() {
             done < <(lms_catalogue "$base")
             ;;
         zai)
-            ids+=('glm-5.2'); ui_add_item 'glm-5.2' 'flagship coding model - opus/sonnet tier'
+            ids+=('glm-5.3'); ui_add_item 'glm-5.3' 'flagship coding model - opus/sonnet tier'
             ids+=('glm-4.7'); ui_add_item 'glm-4.7' 'fast/cheap tier - haiku'
             ;;
     esac