Release 2.0.9: editing batch (#207 #206 #205 #204 #203 #201 #200 #199 #198)

[Sportinger]

Editing-focused batch, verified in-app. Build + lint + 3306 tests green.

Closes #207
Closes #206
Closes #205
Closes #204
Closes #203
Closes #201
Closes #200
Closes #199
Closes #198

Changes

• pressing del when in media panel shoudl delete highligts in media panel #207 Delete/Backspace removes selected media-panel items (hover-scoped)
• text edit mode should be the same edit mode as fiels, or integrate into them so when sser clicks text clip he can edit #206 text-clip editing is integrated into the layer-edit mode — move/scale handles by default, double-click to type, Esc back; themed grey pasteboard backdrop while typing
• text edit mode should have normal handles, and only if hilding strg than user can frele move verticeis around. so we dont need the "shift" hold down anymore to align stuff. #205 normal (rectangular) resize handles by default; Ctrl = free corners/edges; Shift-to-align removed
• text editor ffield has to be the same size as comp when being created #204 newly created text fields fill the composition
• source palyer only paly ado fiels one time. next wont play. #203 source player rewinds ended audio before replay (+ reload fallback)
• slot view in media panel should also previw videos like in flash board #201 slot/grid view scrubs a video preview on hover, like the board
• "going back" shoudl never leave the side #200 browser back/swipe is trapped so it never leaves the app
• on first expand, chat generate downlaods bubble is very laggy #199 AI tray prefetches its heavy chunk on idle/hover + memoized queue → first expand isn't laggy
• cant scroll the panel reiter menue "change to" #198 dock "Change to" submenu scrolls (internal scroll no longer closes the menu)

Also (refinements verified during review)

• Edit-mode click selects the topmost layer (z-order fix)
• Arrow-key clip nudging in edit mode (Alt larger / Ctrl finer, zoom-aware)
• Drag-reorder video layers (z-order) and audio/MIDI tracks via a left-edge grip on track headers
• Live text-selection highlight while dragging

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