i18n(timeline): translate analytics +page.svelte via $_() — header, summary cards, sections

- Header: page title (Zeitanalyse), period selector (7T/14T/30T) interpolated via {n}
- 4 summary stat labels (Gesamt/Tage Streak/Plan-Treue/Einträge)
- 4 card titles (Zeitverteilung/Tagesverteilung/Habit-Aktivität (90 Tage)/Plan vs Realität)
- Empty-state copy + heatmap cell title with {date}/{count} interpolation
- 4 adherence labels (Geplant/Erledigt/Treue/Ø Abweichung)
- Dead `dayLabels` constant removed (was unused — date-fns formatter renders weekday names directly)

Baselines: hardcoded 1181 → 1170 (11 cleared); missing-keys baseline unchanged.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/i18n-hardcoded-baseline.json

@@ -321,7 +321,6 @@
 	"apps/mana/apps/web/src/routes/(app)/tags/+page.svelte": 3,
 	"apps/mana/apps/web/src/routes/(app)/teams/+page.svelte": 2,
 	"apps/mana/apps/web/src/routes/(app)/timeline/+page.svelte": 1,
-	"apps/mana/apps/web/src/routes/(app)/timeline/analytics/+page.svelte": 11,
 	"apps/mana/apps/web/src/routes/(app)/times/clients/[id]/+page.svelte": 2,
 	"apps/mana/apps/web/src/routes/(app)/times/clock/+page.svelte": 1,
 	"apps/mana/apps/web/src/routes/(app)/times/projects/[id]/+page.svelte": 3,