agent: dogfood polish 2026/04/19 — Linux native chrome + History redesign + mic picker cleanup

Second dogfood sprint. Headline fix: Linux now uses native KWin/Mutter
decorations instead of fragile frameless `startResizeDragging`, which
collapsed diagonal corner resize to a single axis and made drag feel
laggy. macOS / Windows keep custom chrome via `useCustomChrome` gate.

Other changes:

- Cross-window preferences sync via `kon:preferences-changed` Tauri
  event — theme and font changes propagate live to float/viewer.
- Hotkey recorder rewritten to use capture-phase document listener
  gated by $effect; button focus was unreliable in webkit2gtk.
- History page redesigned for cognitive-load hygiene: title-first
  compact row, inline title input, Edit popout opening /viewer in
  edit mode, clipboard export as .md with YAML frontmatter, manual
  tag chips + + Add tag input, header tag filter (cap 7), global
  Starred filter, `tag:xyz` search syntax.
- `deriveAutoTags` kept as empty hook for post-Task-7 LLM topic tags;
  research found all previous auto-tag chips redundant with row UI.
- Viewer window adds edit mode with debounced-save textarea; native
  title renamed to "Kon - Transcription Editor".
- Window minimums updated per GNOME HIG + WCAG reflow research:
  main 960x600, float 360x480, editor 560x520.
- Microphone picker filters raw ALSA strings (hw:, plughw:, front:,
  sysdefault:, null) and dedupes by CARD=X. New `description` field
  on DeviceInfo reads /proc/asound/cards so Blue Yeti shows as "Blue
  Microphones" instead of the short "Microphones" card name.
- GPU reporting fixed: get_runtime_capabilities now returns
  accelerators=[cpu,vulkan] and whisper.supports_gpu=true, matching
  the transcribe-rs whisper-vulkan feature linked unconditionally.
- ResizeHandles kept for macOS/Windows frameless: 12px edges, 20px
  corners via CSS vars, pointerdown + setPointerCapture, corners
  above edges in z-order, rendered as sibling (not child) of the
  animated layout root so `position: fixed` is viewport-relative.
- Dueling drag-region handlers removed — `data-tauri-drag-region` and
  manual `startDragging()` were stacked on the same elements; kept
  the manual handler which has the button/input early-return logic.

See HANDOVER.md for the full session log and deferred items.

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

src/routes/viewer/+page.svelte

@@ -19,6 +19,10 @@
   let showStarredOnly = $state(false);
   let animFrameId = null;
   let segmentRefs = [];
+  let viewerMode = $state("view"); // "view" | "edit"
+  let textDraft = $state("");
+  let textDirty = $state(false);
+  let textSaveTimer = null;
 
 
   // Load item data from localStorage (set by HistoryPage before opening this window)
@@ -27,6 +31,7 @@
       const raw = localStorage.getItem("kon_viewer_item");
       if (raw) {
         item = JSON.parse(raw);
+        textDraft = item?.text || "";
         if (item.audioPath) {
           const src = convertFileSrc(item.audioPath);
           const audio = new Audio(src);
@@ -36,6 +41,8 @@
           audioEl = audio;
         }
       }
+      const mode = localStorage.getItem("kon_viewer_mode");
+      if (mode === "edit" || mode === "view") viewerMode = mode;
     } catch {}
 
     // Listen for new items via storage events
@@ -46,6 +53,12 @@
     if (audioEl) audioEl.pause();
     cancelAnimationFrame(animFrameId);
     window.removeEventListener("storage", handleStorageChange);
+    // Flush any pending text edit before the window tears down.
+    if (textSaveTimer) {
+      clearTimeout(textSaveTimer);
+      textSaveTimer = null;
+    }
+    if (textDirty) commitTextEdit();
   });
 
   function handleStorageChange(e) {
@@ -218,6 +231,29 @@
     } catch {}
   }
 
+  function scheduleTextSave() {
+    textDirty = true;
+    clearTimeout(textSaveTimer);
+    textSaveTimer = setTimeout(() => {
+      commitTextEdit();
+    }, 400);
+  }
+
+  function commitTextEdit() {
+    if (!item) return;
+    const next = textDraft;
+    if (next === item.text) {
+      textDirty = false;
+      return;
+    }
+    item.text = next;
+    // The compact preview in History is derived from `preview`; keep it
+    // roughly in sync so the list does not show stale copy after an edit.
+    item.preview = next.slice(0, 120);
+    saveItemToHistory();
+    textDirty = false;
+  }
+
   // Filtered segments (starred filter + search)
   let visibleSegments = $derived.by(() => {
     if (!item?.segments) return [];
@@ -228,39 +264,28 @@
     return segs;
   });
 
-  // Window drag
+  // Window drag — pointerdown + setPointerCapture avoids the mousedown
+  // latency that makes KWin's initial grab feel draggy.
   function handleDragStart(e) {
     if (e.button !== 0) return;
     if (e.target.closest("button")) return;
     if (e.target.closest("input")) return;
+    try { e.currentTarget?.setPointerCapture?.(e.pointerId); } catch {}
     getCurrentWindow().startDragging();
   }
 
-  function closeWindow() {
-    getCurrentWindow().close();
-  }
 </script>
 
 <div class="flex flex-col h-full bg-bg">
   <!-- Drag handle -->
   <div
     class="flex items-center h-[36px] bg-bg-elevated select-none px-3"
-    onmousedown={handleDragStart}
-    data-tauri-drag-region
+    onpointerdown={handleDragStart}
   >
-    <span class="text-[12px] font-medium text-text-secondary tracking-wide" data-tauri-drag-region>
-      Kon - Viewer
+    <span class="text-[12px] font-medium text-text-secondary tracking-wide">
+      Kon - {viewerMode === "edit" ? "Editor" : "Viewer"}
     </span>
-    <div class="flex-1" data-tauri-drag-region></div>
-    <button
-      class="w-7 h-7 flex items-center justify-center text-text-tertiary hover:text-danger rounded-md hover:bg-hover"
-      onclick={closeWindow}
-      aria-label="Close"
-    >
-      <svg class="w-3.5 h-3.5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5">
-        <path d="M18 6L6 18M6 6l12 12" stroke-linecap="round" />
-      </svg>
-    </button>
+    <div class="flex-1"></div>
   </div>
 
   {#if item}
@@ -328,7 +353,8 @@
       </div>
     {/if}
 
-    <!-- Search bar + view controls -->
+    <!-- Search bar + view controls (segment-specific; hidden in edit mode) -->
+    {#if viewerMode !== "edit"}
     <div class="flex items-center gap-2 px-5 py-2 border-b border-border-subtle">
       <div class="flex items-center gap-2 bg-bg-input border border-border rounded-lg px-3 py-1.5 focus-within:border-accent flex-1">
         <svg class="w-3.5 h-3.5 text-text-tertiary flex-shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
@@ -362,10 +388,20 @@
         title={showStarredOnly ? "Show all segments" : "Show starred only"}
       >Starred</button>
     </div>
+    {/if}
 
-    <!-- Transcript segments -->
+    <!-- Transcript segments / editor -->
     <div class="flex-1 overflow-y-auto px-5 py-3 min-h-0">
-      {#if item.segments && item.segments.length > 0}
+      {#if viewerMode === "edit"}
+        <textarea
+          class="w-full h-full bg-bg-input border border-border rounded-lg px-3 py-2 text-[13px]
+                 text-text leading-relaxed resize-none focus:outline-none focus:border-accent"
+          bind:value={textDraft}
+          oninput={scheduleTextSave}
+          data-no-transition
+          placeholder="Edit the transcript..."
+        ></textarea>
+      {:else if item.segments && item.segments.length > 0}
         <div class="flex flex-col gap-1">
           {#each visibleSegments as seg (seg._idx)}
             <div