fix(display): use fraction slash in Temp/Hum page

ESPHome reserves '/' for URL path separators and warns that this
name will become an error in 2026.7.0.

Use the Unicode fraction slash in the SH1106 multi-page package and
the checked-in full config so the repo matches ESPHome's automatic
replacement. Keep spaces around the replacement character because
GitHub's diff view renders the unspaced glyph ambiguously, which
makes the rename hard to review.

Fixes: #183

Author: jkoelker

full_config/ag-one.yaml

@@ -499,7 +499,7 @@ switch:
     disabled_by_default: false
     assumed_state: false
   - platform: template
-    name: Display Temp/Hum Page
+    name: Display Temp ⁄ Hum Page
     id: display_air_temp_page
     restore_mode: RESTORE_DEFAULT_OFF
     optimistic: true

packages/display_sh1106_multi_page.yaml

@@ -280,7 +280,7 @@ switch:
     icon: "mdi:monitor"
 
   - platform: template
-    name: "Display Temp/Hum Page"
+    name: "Display Temp ⁄ Hum Page"
     id: display_air_temp_page
     restore_mode: RESTORE_DEFAULT_OFF
     optimistic: True