Release 2.0.8: UI batch fixes (#194 #190 #188 #187 #177 #174)

[Sportinger]

Batch of UI fixes/features, bundled and verified together (build + lint + 3306 tests green; manually confirmed in-app).

Closes #194
Closes #190
Closes #188
Closes #187
Closes #177
Closes #174

Changes

• drag drop multiple file sinto media panel or on timeline. drag drop on timeline shoudl be same path over media panel input to timeline. if now alrdy #194 — drag & drop multiple files into the media panel or directly onto the timeline; the timeline now shares the media-panel import path. Root cause of the prior single-file bug: collectDroppedMediaFiles neutered the DataTransfer by awaiting per item — now snapshots all items synchronously first.
• add "+" to every panel so user can easy add panels #190 — a "+" button on every dock tab bar opens a panel picker (addPanelTypeToGroup).
• flashboard background grid flicker during zoom #188 — the media board background grid stays visible while zooming and scales slower than the canvas (parallax) instead of disappearing.
• copy paste duplicate conteetn in media panel #187 — copy/paste/duplicate media items via right-click or Ctrl+C/V/D, with a floating "Copied/Pasted/Duplicated" indicator.
• edit mode backdrop color not effect by color schema #177 — the layer-edit pasteboard backdrop now follows the active color scheme (--preview-pasteboard-bg).
• scroll through dropdowns globally with instant effekt #174 — scroll the mouse wheel over any native dropdown to change its value instantly.

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