Per-project access control + UI/feedback/admin refinements

Access control:
- project_members table; non-admins only see/operate on assigned
  projects (enforced across projects, SOPs, work packages — 403 else),
  admins bypass. Creating a project auto-grants its creator access.
- Admin API to get/set a user's project assignments, plus a checkbox
  assignment dialog in the Admin Console user list.

UI / workflow:
- Login page: drop the "Prime Controls" wordmark next to the logo.
- SOP tool: remove emoji icons from buttons and nav tabs.
- Rename "Step Comments" to "Feedback"; the author auto-populates
  (read-only) from the signed-in user.
- Move usage-log viewing to the Admin Console; add an admin card that
  lists all feedback/comments (who, what, page + step, when).
- Sample project name -> "Micron FMCS Install (sample)".

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

html/project-data.js

@@ -25,7 +25,7 @@
   function cacheRemove(id) { writeLocal(readLocal().filter(function (x) { return x.id !== id; })); }
 
   var SAMPLE_PROJECT = {
-    name: 'Micron — INC Construction Work Packages', number: '26-67-008',
+    name: 'Micron FMCS Install (sample)', number: '26-67-008',
     client: 'Micron Technology, Inc.', division: 'Semiconductor',
     site: 'Boise, ID — Fab', sample: true
   };