Support: add a feedback email, rebrand from Donate, tighten privacy copy

docs/architecture/09-visual-design.md

@@ -124,7 +124,7 @@ UI by swapping one set of values. Borrowed from Carbon's layering model:
   `--accent-soft-hover` are `color-mix(in srgb, var(--accent) 12–20%, var(--bg))`,
   so the wash follows whatever accent + theme is active rather than carrying a
   per-accent value. Use it for a surface that should be _noticed_ without competing
-  with a primary action (the header's **Donate** button).
+  with a primary action (the header's **Support** button).
 - **Field-on-layer (Carbon layering).** A field's fill is **one step off the
   surface it sits on**, alternating like Carbon's field set: `--field-01` on the
   canvas (gray on white / near-black on black), `--field-02` on a `--layer-01`
@@ -188,7 +188,7 @@ UI by swapping one set of values. Borrowed from Carbon's layering model:
   `--accent`), **secondary** (1px `--border-strong`, `--bg` fill —
   so a bordered control on a gray panel goes white, never a darker gray), **ghost** (text-only, borderless; a transparent
   border holds the box size), **soft-accent** (ghost on an `--accent-soft` wash —
-  a low-emphasis solicitation, e.g. Donate), **danger** (filled
+  a low-emphasis solicitation, e.g. Support), **danger** (filled
   `--support-error` — the confirm step), **danger-outline** (secondary geometry,
   red label, filling solid red on hover/focus — a destructive action sitting
   among peers, e.g. a detail view's Delete). 13px 600-weight label. Clear hover/active and a visible
@@ -218,7 +218,7 @@ UI by swapping one set of values. Borrowed from Carbon's layering model:
   Import / Export / About are **icon-only** IconButtons per Carbon's UI-shell
   header — global actions as a right-aligned icon row — with accessible names
   that carry scope, e.g. "Export workspace" vs the preview's per-chart "Export";
-  a divider then sets off the soft-accent Donate, which keeps its text label —
+  a divider then sets off the soft-accent Support, which keeps its text label —
   a solicitation needs the word — and the ghost theme toggle).
 - **Hover is variant-specific:** filled buttons (primary/danger) **darken**
   (`--accent-hover` / a slight brightness drop); outlined/ghost buttons **gain a

docs/architecture/visual-specimen.html

@@ -466,7 +466,7 @@
       .btn-ghost-util:hover {
         background: var(--layer-02);
       }
-      /* Soft-accent: a low-emphasis accent wash (Donate) — noticed, not shouting. */
+      /* Soft-accent: a low-emphasis accent wash (Support) — noticed, not shouting. */
       .btn-soft {
         background: var(--accent-soft);
         color: var(--accent-hover);
@@ -984,7 +984,7 @@
         <h3 style="margin-top: var(--space-6)">Emphasis hierarchy — a header cluster</h3>
         <p class="cap" style="margin-bottom: var(--space-4)">
           Utilities go <strong>ghost</strong> (icon + text, borderless) so they recede; a divider
-          sets off <strong>Donate</strong> on a <strong>soft-accent</strong> wash — one low-key
+          sets off <strong>Support</strong> on a <strong>soft-accent</strong> wash — one low-key
           solicitation, no border. (Carbon: one high-emphasis action per region; utilities at low
           emphasis.)
         </p>
@@ -1024,7 +1024,7 @@
             >About
           </button>
           <span class="hdr-divider"></span>
-          <button class="btn btn-soft">Donate</button>
+          <button class="btn btn-soft">Support</button>
         </div>
       </section>