fix(storage): allow excluding 0-session projects (#45)

The "Exclude this project" button on 0 B / 0-session projects silently
did nothing because the UI guard bailed on sessionCount === 0. Relax
the guard to only bail for date-range-only rules, and show a
prevention-focused confirmation dialog for empty project exclusions.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: tznthou

src/renderer/components/Storage/ConfirmExclusionDialog.tsx

@@ -18,18 +18,24 @@ const HIGH_IMPACT_RATIO = 0.5
 export default function ConfirmExclusionDialog({ title, preview, totalSessions, isApplying, onConfirm, onCancel }: Props) {
   const { t } = useI18n()
   const [acknowledged, setAcknowledged] = useState(false)
+  const isEmpty = preview.sessionCount === 0
   const impactRatio = totalSessions > 0 ? preview.sessionCount / totalSessions : 0
-  const highImpact = impactRatio > HIGH_IMPACT_RATIO
+  const highImpact = !isEmpty && impactRatio > HIGH_IMPACT_RATIO
 
   return (
     <div className={styles.backdrop} onClick={() => { if (!isApplying) onCancel() }}>
       <div className={styles.dialog} onClick={e => e.stopPropagation()}>
         <div className={styles.dialogTitle}>{title}</div>
         <div className={styles.dialogSummary}>
-          <ExclusionPreviewSummary preview={preview} />
-          {totalSessions > 0 && (
-            <span>{t('storage.confirm.impactRatio', { percent: (impactRatio * 100).toFixed(1) })}</span>
-          )}
+          {isEmpty
+            ? <span>{t('storage.confirm.emptyProjectHint')}</span>
+            : <>
+                <ExclusionPreviewSummary preview={preview} />
+                {totalSessions > 0 && (
+                  <span>{t('storage.confirm.impactRatio', { percent: (impactRatio * 100).toFixed(1) })}</span>
+                )}
+              </>
+          }
         </div>
 
         {highImpact && (
@@ -45,7 +51,7 @@ export default function ConfirmExclusionDialog({ title, preview, totalSessions,
             disabled={isApplying}
             onChange={e => setAcknowledged(e.target.checked)}
           />
-          {t('storage.confirm.acknowledge')}
+          {isEmpty ? t('storage.confirm.acknowledgeExclude') : t('storage.confirm.acknowledge')}
         </label>
 
         <div className={styles.dialogActions}>
@@ -55,7 +61,9 @@ export default function ConfirmExclusionDialog({ title, preview, totalSessions,
             disabled={!acknowledged || isApplying}
             onClick={onConfirm}
           >
-            {isApplying ? t('storage.confirm.deleting') : t('storage.confirm.deleteAction')}
+            {isApplying
+              ? isEmpty ? t('storage.confirm.excluding') : t('storage.confirm.deleting')
+              : isEmpty ? t('storage.confirm.excludeAction') : t('storage.confirm.deleteAction')}
           </button>
         </div>
       </div>

src/renderer/components/Storage/StoragePage.tsx

@@ -41,7 +41,8 @@ export default function StoragePage() {
   const openConfirm = useCallback(async (rule: ExclusionRuleInput, title: string) => {
     try {
       const preview = await window.api.previewExclusion(rule)
-      if (preview.sessionCount === 0) {
+      const isProjectOnly = !!(rule.projectId && !rule.dateFrom && !rule.dateTo)
+      if (preview.sessionCount === 0 && !isProjectOnly) {
         return
       }
       setPending({ preview, title })

src/renderer/i18n/messages.ts

@@ -153,6 +153,10 @@ const zhTW = {
   'storage.confirm.impactRatio': '（佔全部 {percent}%）',
   'storage.confirm.warningHighImpact': '⚠️ 此操作將刪除超過一半的資料。請再次確認。',
   'storage.confirm.acknowledge': '我了解此操作不可復原',
+  'storage.confirm.acknowledgeExclude': '我了解排除後該專案不再被索引',
+  'storage.confirm.emptyProjectHint': '此專案目前無任何 session。排除後，未來的 session 也不會被索引。',
+  'storage.confirm.excludeAction': '確認排除',
+  'storage.confirm.excluding': '排除中...',
   'storage.confirm.deleting': '刪除中...',
   'storage.confirm.deleteAction': '確認刪除',
   'dashboard.title': '儀表板',
@@ -423,6 +427,10 @@ const en = {
   'storage.confirm.impactRatio': '({percent}% of total)',
   'storage.confirm.warningHighImpact': '⚠️ This will delete more than half of the data. Please confirm.',
   'storage.confirm.acknowledge': 'I understand this is irreversible',
+  'storage.confirm.acknowledgeExclude': 'I understand this project will no longer be indexed',
+  'storage.confirm.emptyProjectHint': 'This project currently has no sessions. Once excluded, future sessions will not be indexed either.',
+  'storage.confirm.excludeAction': 'Confirm exclude',
+  'storage.confirm.excluding': 'Excluding...',
   'storage.confirm.deleting': 'Deleting...',
   'storage.confirm.deleteAction': 'Confirm delete',
   'dashboard.title': 'Dashboard',