fix(dictation): show user's configured hotkey in hints, not hardcoded Ctrl+Shift+R

Both the status-line hint next to the record button and the empty-state
message now read settings.globalHotkey reactively, so 'Press record or
Super+E' (or whatever the user has bound) stays in sync with the actual
shortcut.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/pages/DictationPage.svelte

@@ -708,7 +708,7 @@
                 Saved{#if extractedCount > 0} · {extractedCount} task{extractedCount === 1 ? '' : 's'} extracted{/if}
               </span>
             {:else}
-              Press record or <kbd class="px-1 py-0.5 rounded bg-bg-elevated text-[10px] text-text-tertiary border border-border-subtle">Ctrl+Shift+R</kbd>
+              Press record or <kbd class="px-1 py-0.5 rounded bg-bg-elevated text-[10px] text-text-tertiary border border-border-subtle">{settings.globalHotkey}</kbd>
             {/if}
           </span>
         {/if}
@@ -853,7 +853,7 @@
           </div>
         {:else if !transcript.trim() && !page.recording && !transcribing}
           <div class="flex-1 flex items-center justify-center">
-            <EmptyState icon={Mic} message="Press record or Ctrl+Shift+R" />
+            <EmptyState icon={Mic} message={`Press record or ${settings.globalHotkey}`} />
           </div>
           <textarea
             bind:this={textareaEl}