chore(reports): drop unused stakeholder.lm.no_canvas lang key

The empty-state rewrite replaced its only usage (empty_title/body/cta/hint);
the key was left defined but unreferenced. Copilot flagged it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GYSPNgLdUwEnxgYqTxMc85

Author: gloriafolaron

app/Language/en-US.ini

@@ -3001,7 +3001,6 @@ stakeholder.kpi.hours_logged = "Hours logged"
 stakeholder.kpi.this_period = "this period"
 stakeholder.overview.coming_title = "Peak this period · Needs attention · ToC narrative · Theory-health strip"
 stakeholder.overview.coming_hint = "The recommend-and-override hero, execution-lens needs-attention block, Theory-of-Change sentence, and theory-health strip land next."
-stakeholder.lm.no_canvas = "No Logic Model canvas authored yet. Build one on the Board to see it read out here."
 stakeholder.lm.empty_title = "Build your Logic Model"
 stakeholder.lm.empty_body = "A Logic Model connects your programs, goals, and milestones into one story — what you do, what changes, and why it matters. It powers this page and the coverage read-out."
 stakeholder.lm.empty_cta = "Build a Logic Model"