feat(effects): the Effects lane and the effect inspector

[EtienneLescot]

PR 6 of the shader effects stack (docs/shader-effects.md, part F). Part of #1210.

What the user sees

• One Effects lane under Full Camera. It shows only while the project has an effect, since only an agent adds them.
• Each pill carries the effect's name. It moves, resizes, copies, pastes and deletes like the other regions. A paste onto another effect is refused with a toast (one effect at a time, K.6).
• The inspector edits the effect's parameters (slider, toggle, colour, point) and its target (image, text, both), shows its cost tier and its code with a copy button, and reports a compile error found by the compositor addon.

How

• useTimeline: updateShaderEffectSpan, updateShaderEffect, and a live path (updateShaderEffectLive then commitShaderEffectChange) so a slider drag is one undo step. Rows added to documentWriteAudit.test.ts.
• checkShaderEffect goes through the native bridge to compositorViewService.checkShaderEffect.
• Copy and paste carry the definition, so a paste into another project recreates it (withPastedShaderEffect).
• 15 locales: the inspector.effect* keys and regionClipboard.pasteEffectOverlap.

Checks

• npm run test: 4794 passed.
• tsc root, tests, workbench, node: clean. Biome: no new warning.

The website docs page follows in a separate PR.

🤖 Generated with Claude Code

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