Polish pass 12 — sentence case on ArticleView, ComposeBox, DMView, SettingsView

- ArticleView: Back, Save/Saved, Repost/Reposted, Comment, Copy link,
  Like/Liked, Post — all button labels capitalised (header + footer)
- ComposeBox: Post, Post poll, Posting…
- DMView: Send, Start
- SettingsView: mute keyword placeholder + Remove button

src/components/article/ArticleView.tsx

@@ -238,7 +238,7 @@ export function ArticleView() {
       {/* Header */}
       <header className="border-b border-border px-4 py-2.5 flex items-center justify-between shrink-0">
         <button onClick={goBack} className="text-text-dim hover:text-text text-[11px] transition-colors">
-          ← back
+          ← Back
         </button>
         <div className="flex items-center gap-2">
           {event && loggedIn && (
@@ -251,7 +251,7 @@ export function ArticleView() {
               }`}
               title={bookmarked ? "Remove bookmark" : "Bookmark article"}
             >
-              {bookmarked ? "▪ saved" : "▫ save"}
+              {bookmarked ? "▪ Saved" : "▫ Save"}
             </button>
           )}
           {event && loggedIn && (
@@ -272,7 +272,7 @@ export function ArticleView() {
                   : "border-border text-text-muted hover:text-accent hover:border-accent/40"
               }`}
             >
-              {reposted ? "reposted" : "repost"}
+              {reposted ? "Reposted" : "Repost"}
             </button>
           )}
           {event && loggedIn && (
@@ -284,7 +284,7 @@ export function ArticleView() {
                   : "border-border text-text-muted hover:text-accent hover:border-accent/40"
               }`}
             >
-              comment
+              Comment
             </button>
           )}
           {naddr && (
@@ -293,7 +293,7 @@ export function ArticleView() {
               className="text-[11px] px-3 py-1 border border-border text-text-muted hover:text-accent hover:border-accent/40 transition-colors"
               title="Copy nostr: link"
             >
-              copy link
+              Copy link
             </button>
           )}
         </div>
@@ -318,7 +318,7 @@ export function ArticleView() {
               disabled={!commentText.trim()}
               className="px-3 py-1.5 bg-accent/10 text-accent text-[12px] rounded-sm hover:bg-accent/20 transition-colors disabled:opacity-40"
             >
-              post
+              Post
             </button>
           </div>
         </div>
@@ -404,7 +404,7 @@ export function ArticleView() {
               {/* Footer */}
               <div className="mt-10 pt-6 border-t border-border flex items-center justify-between">
                 <button onClick={goBack} className="text-text-dim hover:text-text text-[11px] transition-colors">
-                  ← back
+                  ← Back
                 </button>
                 <div className="flex items-center gap-2">
                   {loggedIn && (
@@ -417,7 +417,7 @@ export function ArticleView() {
                           : "border-border text-text-muted hover:text-accent hover:border-accent/40"
                       }`}
                     >
-                      {reacted ? "♥ liked" : "♡ like"}
+                      {reacted ? "♥ Liked" : "♡ Like"}
                     </button>
                   )}
                   {loggedIn && (
@@ -429,7 +429,7 @@ export function ArticleView() {
                           : "border-border text-text-muted hover:text-accent hover:border-accent/40"
                       }`}
                     >
-                      {bookmarked ? "▪ saved" : "▫ save"}
+                      {bookmarked ? "▪ Saved" : "▫ Save"}
                     </button>
                   )}
                   {loggedIn && (
@@ -442,7 +442,7 @@ export function ArticleView() {
                           : "border-border text-text-muted hover:text-accent hover:border-accent/40"
                       }`}
                     >
-                      {reposted ? "reposted" : "repost"}
+                      {reposted ? "Reposted" : "Repost"}
                     </button>
                   )}
                   {loggedIn && (
@@ -450,7 +450,7 @@ export function ArticleView() {
                       onClick={() => { setShowComment(true); scrollRef.current?.scrollTo({ top: 0, behavior: "smooth" }); }}
                       className="text-[11px] px-3 py-1.5 border border-border text-text-muted hover:text-accent hover:border-accent/40 transition-colors"
                     >
-                      comment
+                      Comment
                     </button>
                   )}
                   {loggedIn && (

src/components/dm/DMView.tsx

@@ -227,7 +227,7 @@ function ThreadPanel({
             disabled={!text.trim() || sending}
             className="px-3 self-end py-2 text-[11px] bg-accent hover:bg-accent-hover text-accent-text transition-colors disabled:opacity-30 disabled:cursor-not-allowed shrink-0 focus-visible:ring-1 focus-visible:ring-accent"
           >
-            {sending ? "…" : "send"}
+            {sending ? "…" : "Send"}
           </button>
         </div>
         <p className="text-text-dim text-[10px] mt-1">Ctrl+Enter to send · gift-wrapped (NIP-17)</p>
@@ -276,7 +276,7 @@ function NewConvInput({ onStart }: { onStart: (pubkey: string) => void }) {
           disabled={!input.trim()}
           className="px-2 py-1.5 text-[10px] border border-border text-text-dim hover:text-accent hover:border-accent/40 transition-colors disabled:opacity-30 shrink-0"
         >
-          start
+          Start
         </button>
       </div>
       {error && <p className="text-danger text-[10px] mt-1">{error}</p>}

src/components/feed/ComposeBox.tsx

@@ -341,7 +341,7 @@ export function ComposeBox({ onPublished, onNoteInjected }: { onPublished?: () =
                 disabled={!canPost}
                 className="px-3 py-1 text-[11px] bg-accent hover:bg-accent-hover text-accent-text rounded-sm transition-colors disabled:opacity-30 disabled:cursor-not-allowed"
               >
-                {publishing ? "posting…" : isPoll ? "post poll" : "post"}
+                {publishing ? "Posting…" : isPoll ? "Post poll" : "Post"}
               </button>
             </div>
           </div>

src/components/shared/SettingsView.tsx

@@ -110,7 +110,7 @@ function MutedKeywordsSection() {
                 onClick={() => removeKeyword(kw)}
                 className="text-text-dim hover:text-danger text-[10px] opacity-0 group-hover:opacity-100 transition-opacity shrink-0"
               >
-                remove
+                Remove
               </button>
             </div>
           ))}
@@ -121,7 +121,7 @@ function MutedKeywordsSection() {
           value={input}
           onChange={(e) => { setInput(e.target.value); setError(null); }}
           onKeyDown={handleKeyDown}
-          placeholder="word or phrase to mute"
+          placeholder="Word or phrase to mute"
           className="flex-1 bg-bg border border-border px-3 py-1.5 text-text text-[12px] focus:outline-none focus:border-accent/50 placeholder:text-text-dim"
         />
         <button