fix: hardening round from code review (4 P1 + 15 P2)

P1:
- settingsStore: back up an unparseable settings.json to .bak before
  falling back to defaults, so the next mutation can no longer silently
  wipe custom themes/highlight rules
- ptyDispatcher: fan out per-session data/exit handlers (Set instead of
  a single slot) so SSH split panes stop stealing each other's stream
- FilePanel: monotonic refresh token keeps stale listings from painting
  over a newer navigation; upload finish no longer yanks the panel back
- settings.css: active settings-tab label derives from --chrome-fg so it
  stays visible on the shipped light themes

P2 (main/renderer):
- paste guard: a paste ending in a newline always confirms
- Workspace: closing an SSH pane no longer seeds the local cwd with a
  remote path
- tray: skip close-dialog continuation on a destroyed window
- commands: close zombie 'in-progress' session logs at hydrate
- zmodem: clear the stale offer timer before arming a new one
- connectionsStore: coerce/validate renderer input before persisting
- sftp: OperationError marker class keeps translated errors out of the
  transport-retry classifier
- CommandsPanel: surface save failures inside the dialog
- ConnectionSidebar: drop a tautological tooltip condition

P2 (i18n/tooling/tests):
- localize the 16 ANSI color labels and the highlight sample text
  (21 new keys across zh-CN/zh-TW/en/ja)
- sync-changelog: keep ### subheadings, normalize CRLF notes
- release.cjs: GitHub release reuse-by-tag (idempotent re-runs); fail
  loudly on a failed Gitea asset listing
- commands-store test: absent historyEnabled now truly tests absence

src/main/commands.ts

@@ -229,6 +229,7 @@ export class CommandsStore {
       if (!existsSync(this.indexFile)) return
       const raw: unknown = JSON.parse(readFileSync(this.indexFile, 'utf8'))
       if (!Array.isArray(raw)) return
+      let closed = false
       for (const x of raw) {
         if (
           x &&
@@ -239,10 +240,19 @@ export class CommandsStore {
           // index.json is data, not trust: a tampered or hand-edited `file`
           // must never turn logWrite into an arbitrary-path append.
           if (!this.isLoggableFile(meta.file)) continue
+          // A log still "in progress" here was interrupted by a crash or a
+          // force-kill: its session id belonged to the previous run, so no
+          // logStop will ever match it and its sanitizer is gone (logWrite
+          // would be a permanent no-op). Close it instead of reviving it as
+          // an active entry nothing can ever end.
+          if (meta.endedAt === undefined) {
+            meta.endedAt = Date.now()
+            closed = true
+          }
           this.metasByFile.set(meta.file, meta)
-          if (meta.endedAt === undefined) this.activeBySession.set(meta.sessionId, meta)
         }
       }
+      if (closed) this.persistIndex()
     } catch {
       // index missing / corrupt -> rebuild on next write
     }