feat: ride achievements & badges (phase 3)

[drzeeb]

Phase 3 of the detailed ride analysis screen: achievements & badges.

What's new

A new Achievements section (right under the map) celebrates what each ride accomplished, as a wrap-around row of coloured badge chips.
Per-ride milestones

• Half-century / Century (50 / 100 km)
• Hill climber / Summit seeker (500 / 1000 m of ascent)
• King of the Mountain (a categorised climb — shows its HC / Cat 1-4 grade)
• Speed demon (40 km/h), Endurance (2 h), Calorie crusher (1000 kcal)
• Early bird / Night owl (start time)
  Tiered ones award only the highest reached; each badge shows its achieved value.
  Personal records (gold trophy + accent) when a ride beats every other recorded ride:
• Longest ride, Most climbing, Fastest pace, Top-speed record

Implementation

• Pure, JVM-unit-tested engine evaluateAchievements in core.analysis (no Android), computed off the main thread in the ViewModel from the ride, its analysis and the full ride list.
• AchievementsSection composable renders the badge chips (Material extended icons, per-type colours, gold border for PRs).
• Mock rides earn nothing and are excluded from record comparisons.

Tests

• RideAchievementsTest: century vs half-century tiering, distance personal-record logic (and not awarded when not the longest / for the first-ever ride), mock exclusion. All green.

i18n

• 16 new strings localised across all eight supported languages.
  Next (optional): a shareable report card, and opt-in online data (weather / map-matching).