feat(calendar): filter imported events by title and date

Client-side filter over the already-loaded events list (T6.3, FR-CAL-2)
— 1700+ events from a real mailbox is unwieldy to browse unfiltered.

src/lib/views/Settings.svelte

@@ -173,6 +173,26 @@
   // ---- Calendar / .pst import (T6.1/T6.2/T6.3, FR-CAL-1/2) ----
   let pstPath = $state("");
   let pstPassword = $state("");
+  let eventTitleFilter = $state("");
+  let eventDateFilter = $state("");
+
+  function eventLocalYmd(unixSecs: number | null): string {
+    if (!unixSecs) return "";
+    const d = new Date(unixSecs * 1000);
+    return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}-${String(d.getDate()).padStart(2, "0")}`;
+  }
+
+  let filteredEvents = $derived(
+    calendar.events.filter((ev) => {
+      if (eventDateFilter && eventLocalYmd(ev.starts_at) !== eventDateFilter) return false;
+      if (
+        eventTitleFilter &&
+        !(ev.subject ?? "").toLowerCase().includes(eventTitleFilter.toLowerCase())
+      )
+        return false;
+      return true;
+    }),
+  );
 
   async function pickPstFile() {
     const path = await open({ filters: [{ name: "Outlook data file", extensions: ["pst"] }] });
@@ -708,8 +728,21 @@
         {#if calendar.events.length === 0}
           <p class="muted">No events imported yet.</p>
         {:else}
+          <div class="grid">
+            <label class="wide"
+              >Search title
+              <input type="text" bind:value={eventTitleFilter} placeholder="Meeting name…" />
+            </label>
+            <label
+              >Date
+              <input type="date" bind:value={eventDateFilter} />
+            </label>
+          </div>
+          <p class="muted">
+            {filteredEvents.length} of {calendar.events.length} events
+          </p>
           <ul class="events">
-            {#each calendar.events as ev (ev.id)}
+            {#each filteredEvents as ev (ev.id)}
               <li>
                 <span class="name">{ev.subject ?? "(untitled)"}</span>
                 <span class="muted">{formatEventDate(ev.starts_at)}</span>