redesign: Layout2 design-system + dashboard/tasks rework + perf

Design system (Layout2):
- Solid token-driven theme (no animated grid); single-source tokens for bg,
  cards (bg/border/radius), popups, fonts (Inter), and full semantic +
  data-viz color palette. Swept ~168 hardcoded colors to tokens.

Dashboard:
- Reflow: To Do + Calendar row (fixed right rail) over Activity / In-Progress /
  Team Performance; CSS height-match (To Do = Calendar); responsive stacking.
- 'Tasks Not Started' -> 'To Do' card with R#/Assigned columns; compact money fmt.

Tasks page:
- Combined tabs into Tasks + Completed with a Status column.
- Column-header sort + filter (Status, R#/new-vs-revision, Project, Task Type,
  Company) via portaled, scrollable FilterDropdown; removed toolbar filters and
  the projects side panel; headers stay visible when empty; renamed to 'Tasks'.

Perf:
- FK/filter index migration; removed redundant client/external scope waterfall
  (rely on RLS); parallel follow-up queries.

Mobile:
- Responsive grids; mobile topbar = hamburger only, blends with bg, proper offset.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/pages/CompanyDetail.jsx

@@ -512,7 +512,7 @@ export default function CompanyDetail() {
                 const active = projectTasks.filter(t => t.status !== 'client_approved').length;
                 const done = projectTasks.filter(t => t.status === 'client_approved').length;
                 return (
-                  <div key={project.id} className="interactive-surface" style={{ display: 'flex', alignItems: 'center', background: 'var(--card-bg)', border: '1px solid var(--border)', borderRadius: 4, overflow: 'hidden' }}>
+                  <div key={project.id} className="interactive-surface" style={{ display: 'flex', alignItems: 'center', background: 'var(--card-bg)', border: 'var(--card-border)', borderRadius: 4, overflow: 'hidden' }}>
                     <Link to={`/projects/${project.id}`} className="interactive-row" style={{ flex: 1, display: 'flex', alignItems: 'center', justifyContent: 'space-between', padding: '14px 16px', textDecoration: 'none', cursor: 'pointer' }}>
                       <div>
                         <div style={{ fontWeight: 400, fontSize: 14, color: 'var(--text-primary)' }}>{project.name}</div>
@@ -528,7 +528,7 @@ export default function CompanyDetail() {
                     {isTeam && <button
                       type="button"
                       onClick={() => handleDeleteProject(project)}
-                      style={{ background: 'none', border: 'none', borderLeft: '1px solid var(--border)', color: 'var(--danger, #dc2626)', cursor: 'pointer', fontSize: 16, padding: '0 14px', alignSelf: 'stretch', display: 'flex', alignItems: 'center' }}
+                      style={{ background: 'none', border: 'none', borderLeft: '1px solid var(--border)', color: 'var(--danger, var(--danger-strong))', cursor: 'pointer', fontSize: 16, padding: '0 14px', alignSelf: 'stretch', display: 'flex', alignItems: 'center' }}
                       title="Delete project"
                     >✕</button>}
                   </div>