docs: editor CHANGELOG.md, covering 0.16.0 → 0.21.0

Signed-off-by: flemming-it <sf@flemming.it>

CHANGELOG.md

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+# Changelog
+
+All notable changes to `fai_studio_flow_editor` recorded here.
+Studio bumps its `pubspec.yaml` git ref to a specific release
+of this package on every editor change.
+
+## 0.21.0 — 2026-06-09
+
+### Added
+
+- **Diagnostic-strip "Beheben" button** opens a focused modal
+  enumerating every issue with its quick-fix actions plus an
+  "apply every quick fix" master button. Replaces the
+  cramped expand-strip workflow for operators who want a
+  deliberate dialog instead of scrolling in a 200-px footer.
+
+- **Inline Approve / Reject in the Run tab**. When the hub
+  pauses a flow on `system.approval@^0`, the Run tab now
+  renders a complete approve / reject form directly under the
+  awaiting step. The operator no longer needs to switch to the
+  Approvals page mid-run.
+
+- **`FlowRunDriver` extended** with three new methods (default
+  implementations throw with a clear message so legacy hosts
+  keep compiling): `pendingApprovalIdForStep`,
+  `approveApproval`, `rejectApproval`.
+
+## 0.20.1 — 2026-06-09
+
+### Changed
+
+- **Flow list rows** in the sidebar get a leading 28×28 icon
+  tile (`account_tree_outlined`), active-row accent + weight,
+  and compact byte formatting (B / KB / MB). Long names no
+  longer overflow into a multi-line ellipsis; size strings
+  read as `4.3 KB` instead of `4321 B`.
+
+## 0.20.0 — 2026-06-09
+
+### Added
+
+- **Localised analyzer + strip + run messages**. Every analyzer
+  message and every quick-fix label flows through the new
+  `AnalyzerStrings` adapter, populated from the editor's locale.
+  Strip + hover card + run-block tooltip + inline message
+  + step row + CopyableErrorBox tooltips all moved to the
+  string table.
+
+### Fixed
+
+- **Real monospace font everywhere**. The editor previously
+  used `fontFamily: 'JetBrains Mono'` as a bare string with no
+  fallback. The package never bundled the font; only Studio
+  pre-loaded it via `google_fonts`. Hosts without Studio's
+  setup saw the YAML editor render in the system proportional
+  default. New `_monoTextStyle()` helper pins
+  `fontFamilyFallback` to a cross-platform monospace chain.
+
+## 0.19.0 — 2026-06-08
+
+### Added
+
+- **Persistent diagnostic strip** below the TabBarView. Same
+  issue list visible on Graph + Text + Run tabs.
+- **Run button blocked** when the analyzer reports errors.
+  Both the action-strip Run and the RunTab Start button gate
+  on `analyzerErrorCount`.
+- **Run failures copyable** via a new `_CopyableErrorBox`.
+
+## 0.18.0 — 2026-06-08
+
+### Added
+
+- **Graph nodes pulse on error**. Steps + pseudo-nodes
+  (inputs / outputs) carrying analyzer issues render a
+  breathing halo in the matching severity colour.
+- **Store-aware install / add-source**. Analyzer takes a
+  `storeCapabilities` closure; unknown-capability fixes
+  switch between "Install" (in store) and "Add source for…"
+  (not in store).
+- **Did-you-mean suggestion** within Levenshtein distance 2.
+
+## 0.17.0 — 2026-06-08
+
+### Added
+
+- **Copyable diagnostics + hover tooltip + quick fixes**. Strip
+  rows use SelectableText with per-row Copy. Wavy underlines
+  publish hover-tooltip requests via a ValueNotifier; an
+  OverlayEntry card renders the message + fix buttons near
+  the cursor.
+- **`InstallCapabilityFix`** delegates to a host callback
+  (`onInstallCapability`).
+
+## 0.16.0 — 2026-06-08
+
+### Fixed
+
+- **Editor gutter glitches**. The `flutter_code_editor` gutter
+  hard-positioned an `Icons.cancel` pin in a 16-px slot with a
+  popup that painted over the code area. Hidden via
+  `showErrors: false`; replaced with a bottom diagnostic strip
+  the editor owns.
+
+## 0.15.x — 0.14.x
+
+Earlier development. See git log.