feat(phase9): History LLM tag UI — per-row Tag, chips, promote, batch

Per-row Tag button calls extract_content_tags_cmd, persists via
saveTranscriptMeta. Dashed-italic chips render the AI tags distinct
from manual; clicking a chip promotes it into manualTags (the
LLM tag disappears, the manual one stays). Top toolbar gains "Tag all
untagged" for batch tagging across the corpus, with progress text.
Existing addManualTag / removeManualTag handlers swap their no-op
saveHistory() calls for saveTranscriptMeta — picks up the latent
manualTags persistence bug as a side effect.

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

src/lib/pages/HistoryPage.svelte

@@ -2,7 +2,13 @@
   // @ts-nocheck
   import { onDestroy } from "svelte";
   import { invoke } from "@tauri-apps/api/core";
-  import { history, saveHistory, deleteFromHistory, renameHistoryEntry } from "$lib/stores/page.svelte.js";
+  import {
+    history,
+    saveHistory,
+    saveTranscriptMeta,
+    deleteFromHistory,
+    renameHistoryEntry,
+  } from "$lib/stores/page.svelte.js";
   import { toasts } from "$lib/stores/toasts.svelte.js";
   import { convertFileSrc } from "@tauri-apps/api/core";
   import {
@@ -20,7 +26,7 @@
   import EmptyState from "$lib/components/EmptyState.svelte";
   import { formatTime, formatDuration } from "$lib/utils/time.js";
   import { PLAYBACK_SPEEDS } from "$lib/utils/constants.js";
-  import { Search, Clock, Play, Pause, FileText, Mic, ChevronDown, ExternalLink, Star } from 'lucide-svelte';
+  import { Search, Clock, Play, Pause, FileText, Mic, ChevronDown, ExternalLink, Star, Tag } from 'lucide-svelte';
 
   const prefs = getPreferences();
   const COLLAPSED_ROW_MIN_HEIGHT = 54;
@@ -337,14 +343,79 @@
       return;
     }
     item.manualTags = [...(item.manualTags || []), next];
-    saveHistory();
+    saveTranscriptMeta(item.id, { manualTags: item.manualTags });
     e.target.value = "";
   }
 
   function removeManualTag(item, tag) {
     const t = normaliseTag(tag);
     item.manualTags = (item.manualTags || []).filter((x) => normaliseTag(x) !== t);
-    saveHistory();
+    saveTranscriptMeta(item.id, { manualTags: item.manualTags });
+  }
+
+  // Phase 9 LLM content tagging.
+  let tagging = $state(new Set());
+  let bulkTagging = $state(false);
+  let bulkTaggingProgress = $state("");
+
+  async function tagRow(item) {
+    if (tagging.has(item.id)) return;
+    const next = new Set(tagging);
+    next.add(item.id);
+    tagging = next;
+    try {
+      const result = await invoke("extract_content_tags_cmd", {
+        transcript: item.text || "",
+      });
+      const r = result;
+      item.llmTags = [`topic:${r.topic}`, `intent:${r.intent}`];
+      await saveTranscriptMeta(item.id, { llmTags: item.llmTags });
+    } catch (err) {
+      toasts.error("Tagging failed", String(err));
+    } finally {
+      const rest = new Set(tagging);
+      rest.delete(item.id);
+      tagging = rest;
+    }
+  }
+
+  function promoteLlmTag(item, tag) {
+    const normalised = normaliseTag(tag);
+    const manual = new Set((item.manualTags || []).map(normaliseTag));
+    manual.add(normalised);
+    item.manualTags = [...manual];
+    item.llmTags = (item.llmTags || []).filter((t) => normaliseTag(t) !== normalised);
+    saveTranscriptMeta(item.id, {
+      manualTags: item.manualTags,
+      llmTags: item.llmTags,
+    });
+  }
+
+  async function tagAllUntagged() {
+    if (bulkTagging) return;
+    bulkTagging = true;
+    try {
+      const untagged = history.filter((i) => !i.llmTags || i.llmTags.length === 0);
+      let done = 0;
+      for (const item of untagged) {
+        done += 1;
+        bulkTaggingProgress = `${done} / ${untagged.length}`;
+        try {
+          const result = await invoke("extract_content_tags_cmd", {
+            transcript: item.text || "",
+          });
+          const r = result;
+          item.llmTags = [`topic:${r.topic}`, `intent:${r.intent}`];
+          await saveTranscriptMeta(item.id, { llmTags: item.llmTags });
+        } catch (err) {
+          console.error("bulk tag failed for", item.id, err);
+        }
+      }
+      toasts.success(`Tagged ${untagged.length} transcript${untagged.length === 1 ? "" : "s"}`);
+    } finally {
+      bulkTagging = false;
+      bulkTaggingProgress = "";
+    }
   }
 
   async function exportMarkdown(item) {
@@ -459,6 +530,17 @@
       <Star size={14} aria-hidden="true" />
       <span class="text-[11px]">Starred</span>
     </button>
+    {#if history.some((i) => !i.llmTags || i.llmTags.length === 0)}
+      <button
+        class="btn-md rounded-lg text-text-tertiary hover:text-text hover:bg-hover disabled:opacity-50 inline-flex items-center gap-1.5"
+        onclick={tagAllUntagged}
+        disabled={bulkTagging}
+        title="Run AI content tagging across every untagged transcript"
+      >
+        <Tag size={13} aria-hidden="true" />
+        <span class="text-[11px]">{bulkTagging ? `Tagging ${bulkTaggingProgress}` : "Tag all untagged"}</span>
+      </button>
+    {/if}
     {#if history.length > 0}
       <button
         class="btn-md rounded-lg text-text-tertiary hover:text-danger hover:bg-hover"
@@ -708,6 +790,17 @@
                           >×</button>
                         </span>
                       {/each}
+                      <!-- Phase 9 LLM-generated tags. Dashed border + italic
+                           distinguishes from manual chips. Click to promote
+                           into manualTags. -->
+                      {#each (item.llmTags || []) as t (t)}
+                        <button
+                          class="inline-flex items-center px-2 py-0.5 rounded-full text-[10px] italic border border-dashed border-border-subtle text-text-tertiary hover:text-text hover:border-accent"
+                          onclick={() => promoteLlmTag(item, t)}
+                          title="Click to keep as a manual tag"
+                          aria-label={`Promote ${t} to manual tag`}
+                        >{t}</button>
+                      {/each}
                       <input
                         type="text"
                         class="bg-bg-input border border-border rounded-full px-2 py-0.5 text-[10px]
@@ -743,6 +836,17 @@
                         onclick={(e) => { e.stopPropagation(); exportMarkdown(item); }}
                         title="Export this transcript as a Markdown file with YAML frontmatter"
                       >Export .md</button>
+                      <button
+                        class="inline-flex items-center gap-1.5 text-[11px] px-3 py-1.5 rounded-lg bg-hover text-text-secondary hover:text-text disabled:opacity-50"
+                        style="transition-duration: var(--duration-ui)"
+                        onclick={(e) => { e.stopPropagation(); tagRow(item); }}
+                        disabled={tagging.has(item.id)}
+                        title="Generate AI content tags (topic and intent)"
+                        aria-label="Generate content tags with AI"
+                      >
+                        <Tag size={11} aria-hidden="true" />
+                        {tagging.has(item.id) ? "Tagging…" : "Tag"}
+                      </button>
                       {#if item.audioPath && item.segments && item.segments.length > 0}
                         <button
                           class="text-[11px] px-3 py-1.5 rounded-lg bg-hover text-accent hover:text-accent-hover"