fix(ui): right slide-out sheet for oversized modals on phones; 360px fixes

Auditing at 360x760 (Firefox's smallest emulated device; Galaxy S25
class) — 390 was too generous a baseline — the Customize Dashboard
pop-up was the worst page in the app: its card measured 986px in a
760px viewport with no internal scroll, so Cancel/Save sat ~90px below
the fold on a fixed, non-scrolling overlay — unreachable.

New reusable shell: .app-modal-panel (input.css) renders a centered
dialog on desktop (>=640px, unchanged) and a full-height right
slide-out sheet on phones: h-dvh, rounded-l-2xl, slide-in animation
(replays on every open because the overlay toggles display), internal
scroll, overscroll containment. Overlay pairs with items-stretch /
justify-end below sm.

Converted the measured overflows:
- Customize Dashboard (986px): sheet + sticky header/footer, rows wrap
  with the Restore/toggle group right-aligned (ml-auto), titles
  truncate, System badge shrink-0.
- Collection create/edit (796px, cut at both ends at 360): sheet +
  sticky header/footer; edit modal shared the file.

Also at 360: admin-library's Archived buttons row (View Archived +
Purge Archived Now, 315px at x=49) inflated the page to 364px — now
flex-wrap. Collection-episodes shows a 1px sub-pixel rounding artifact
(vw=361) — left as-is, invisible.

Verified at 360x760: sheet geometry (footer bottom 739 < 760), rows
fit, desktop 1280 screenshot unchanged; full-route sweep at 360 shows
no page-level horizontal overflow beyond the two notes above.

templates/collection_modal_templ.go

@@ -29,7 +29,7 @@ func CollectionModal(collection CollectionData) templ.Component {
 			templ_7745c5c3_Var1 = templ.NopComponent
 		}
 		ctx = templ.ClearChildren(ctx)
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 1, "<div x-data=\"collections\" class=\"fixed inset-0 z-[65] flex items-center justify-center p-4\" style=\"background-color: var(--surface-overlay);\"><div class=\"card p-6 w-full max-w-md\" style=\"box-shadow: var(--shadow-pop);\"><div class=\"flex justify-between items-center mb-6\"><div class=\"flex items-center gap-3\"><span class=\"grid place-items-center h-10 w-10 rounded-xl shrink-0\" style=\"background-color: var(--accent-muted); color: var(--accent);\">")
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 1, "<div x-data=\"collections\" class=\"fixed inset-0 z-[65] flex items-stretch justify-end sm:items-center sm:justify-center sm:p-4\" style=\"background-color: var(--surface-overlay);\"><div class=\"app-modal-panel card p-5 sm:p-6 sm:max-w-md\"><div class=\"sticky top-0 z-10 flex justify-between items-center -mx-5 px-5 pb-3 mb-5 border-b sm:-mx-6 sm:px-6\" style=\"background-color: var(--bg-secondary); border-color: var(--border);\"><div class=\"flex items-center gap-3\"><span class=\"grid place-items-center h-10 w-10 rounded-xl shrink-0\" style=\"background-color: var(--accent-muted); color: var(--accent);\">")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
@@ -163,7 +163,7 @@ func CollectionModal(collection CollectionData) templ.Component {
 					return templ_7745c5c3_Err
 				}
 			}
-			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 17, " class=\"h-4 w-4 accent-current\"> <span>Show Up Next strip</span></label></div></div><div class=\"flex justify-end space-x-3\"><button type=\"button\" @click=\"closeCollectionModal($el)\" class=\"btn btn-secondary\">Cancel</button> <button type=\"submit\" class=\"btn btn-primary\">Update Collection</button></div></form>")
+			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 17, " class=\"h-4 w-4 accent-current\"> <span>Show Up Next strip</span></label></div></div><div class=\"sticky bottom-0 z-10 flex justify-end space-x-3 -mx-5 px-5 py-3 border-t sm:-mx-6 sm:px-6\" style=\"background-color: var(--bg-secondary); border-color: var(--border);\"><button type=\"button\" @click=\"closeCollectionModal($el)\" class=\"btn btn-secondary\">Cancel</button> <button type=\"submit\" class=\"btn btn-primary\">Update Collection</button></div></form>")
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
@@ -181,7 +181,7 @@ func CollectionModal(collection CollectionData) templ.Component {
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
-			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 19, "\"><div id=\"icon-grid\" class=\"grid grid-cols-8 gap-1 max-h-32 overflow-y-auto p-2 rounded-lg border\" style=\"background-color: var(--bg-primary); border-color: var(--border);\"></div></div><div class=\"mb-6\"><label class=\"block text-xs font-semibold uppercase tracking-wide mb-2\" style=\"color: var(--text-secondary)\">Color</label><div class=\"flex gap-2\"><button type=\"button\" @click=\"selectColor('blue')\" data-color=\"blue\" class=\"w-8 h-8 rounded-full color-option bg-blue-500 hover:ring-2 hover:ring-offset-2 hover:ring-offset-transparent hover:ring-blue-400\" aria-label=\"Blue\"></button> <button type=\"button\" @click=\"selectColor('red')\" data-color=\"red\" class=\"w-8 h-8 rounded-full color-option bg-red-500 hover:ring-2 hover:ring-offset-2 hover:ring-offset-transparent hover:ring-red-400\" aria-label=\"Red\"></button> <button type=\"button\" @click=\"selectColor('yellow')\" data-color=\"yellow\" class=\"w-8 h-8 rounded-full color-option bg-yellow-500 hover:ring-2 hover:ring-offset-2 hover:ring-offset-transparent hover:ring-yellow-400\" aria-label=\"Yellow\"></button> <button type=\"button\" @click=\"selectColor('green')\" data-color=\"green\" class=\"w-8 h-8 rounded-full color-option bg-green-500 hover:ring-2 hover:ring-offset-2 hover:ring-offset-transparent hover:ring-green-400\" aria-label=\"Green\"></button> <button type=\"button\" @click=\"selectColor('purple')\" data-color=\"purple\" class=\"w-8 h-8 rounded-full color-option bg-purple-500 hover:ring-2 hover:ring-offset-2 hover:ring-offset-transparent hover:ring-purple-400\" aria-label=\"Purple\"></button></div><input type=\"hidden\" name=\"color\" id=\"collection-color\" value=\"blue\"></div><div class=\"flex justify-end space-x-3\"><button type=\"button\" @click=\"closeCollectionModal($el)\" class=\"btn btn-secondary\">Cancel</button> <button type=\"submit\" class=\"btn btn-primary\">Create Collection</button></div></form>")
+			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 19, "\"><div id=\"icon-grid\" class=\"grid grid-cols-8 gap-1 max-h-32 overflow-y-auto p-2 rounded-lg border\" style=\"background-color: var(--bg-primary); border-color: var(--border);\"></div></div><div class=\"mb-6\"><label class=\"block text-xs font-semibold uppercase tracking-wide mb-2\" style=\"color: var(--text-secondary)\">Color</label><div class=\"flex gap-2\"><button type=\"button\" @click=\"selectColor('blue')\" data-color=\"blue\" class=\"w-8 h-8 rounded-full color-option bg-blue-500 hover:ring-2 hover:ring-offset-2 hover:ring-offset-transparent hover:ring-blue-400\" aria-label=\"Blue\"></button> <button type=\"button\" @click=\"selectColor('red')\" data-color=\"red\" class=\"w-8 h-8 rounded-full color-option bg-red-500 hover:ring-2 hover:ring-offset-2 hover:ring-offset-transparent hover:ring-red-400\" aria-label=\"Red\"></button> <button type=\"button\" @click=\"selectColor('yellow')\" data-color=\"yellow\" class=\"w-8 h-8 rounded-full color-option bg-yellow-500 hover:ring-2 hover:ring-offset-2 hover:ring-offset-transparent hover:ring-yellow-400\" aria-label=\"Yellow\"></button> <button type=\"button\" @click=\"selectColor('green')\" data-color=\"green\" class=\"w-8 h-8 rounded-full color-option bg-green-500 hover:ring-2 hover:ring-offset-2 hover:ring-offset-transparent hover:ring-green-400\" aria-label=\"Green\"></button> <button type=\"button\" @click=\"selectColor('purple')\" data-color=\"purple\" class=\"w-8 h-8 rounded-full color-option bg-purple-500 hover:ring-2 hover:ring-offset-2 hover:ring-offset-transparent hover:ring-purple-400\" aria-label=\"Purple\"></button></div><input type=\"hidden\" name=\"color\" id=\"collection-color\" value=\"blue\"></div><div class=\"sticky bottom-0 z-10 flex justify-end space-x-3 -mx-5 px-5 py-3 border-t sm:-mx-6 sm:px-6\" style=\"background-color: var(--bg-secondary); border-color: var(--border);\"><button type=\"button\" @click=\"closeCollectionModal($el)\" class=\"btn btn-secondary\">Cancel</button> <button type=\"submit\" class=\"btn btn-primary\">Create Collection</button></div></form>")
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}