Fix E2E select locator, remove maxspeed mode (data unavailable)

E2E fixes:
- Color mode select locator uses option[value='highway'] filter
  instead of fragile page.locator("select").last()

Removed maxspeed color mode:
- BRouter does not expose maxspeed in WayTags output despite the tag
  existing in its lookup table. The dummyUsage profile trick only
  affects cost calculation, not tiledesc output.
- Can revisit if BRouter adds maxspeed to WayTags in a future version
  or if we fork/patch the BRouter profiles more deeply.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/i18n/src/locales/de.ts

@@ -103,7 +103,6 @@ export default {
       surface: "Untergrund",
       grade: "Steigung",
       highway: "Straßentyp",
-      maxspeed: "Tempolimit",
       surfaceLegend: "Farbe nach Straßenbelag",
       surfaceUnavailable: "Untergrunddaten für dieses Profil nicht verfügbar",
     },
@@ -114,7 +113,6 @@ export default {
       profile: "Höhenprofil",
       grade: "Steigungsprofil",
       highway: "Straßentypenprofil",
-      maxspeed: "Tempolimitprofil",
       low: "Tief",
       high: "Hoch",
     },

packages/i18n/src/locales/en.ts

@@ -103,7 +103,6 @@ export default {
       surface: "Surface",
       grade: "Grade",
       highway: "Road Type",
-      maxspeed: "Speed Limit",
       surfaceLegend: "Color by road surface type",
       surfaceUnavailable: "Surface data not available for this profile",
     },
@@ -114,7 +113,6 @@ export default {
       profile: "Elevation Profile",
       grade: "Grade Profile",
       highway: "Road Type Profile",
-      maxspeed: "Speed Limit Profile",
       low: "Low",
       high: "High",
     },