v1.1.0

feat(connected): manual cross-platform identity merge

Dashboard/data/identities.json maps '<platform>:<chat_id>' members to one
named entity; merging applies to the 'all' variant only (per-platform
views stay unmerged) and only when >=2 mapped members are present.
Volumes/sessions summed at the raw-accumulator level, shares and dates
recomputed; merged entities carry platform='merged' + a per-platform
breakdown for the ⧉ badge/tooltips. '⧉ Merge contacts' manage panel in
the connected view persisting via a profile-aware /identities launcher
route (file:// falls back with a visible hint); merging takes effect on
re-analysis. No automatic name matching anywhere by design. Malformed
mapping files warn-and-skip at build level. 18 new tests; connected
insight rules regression-proven over a real merged entity.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>