feat(primitives): media-editor components, category reorg, perf + type cleanup

Reorganize components into category folders (forms/canvas/overlays/etc.); add the
media-editor headless family (timeline, curve-editor, waveform, crop, color
picker, etc.); apply perf fixes (O(1) collection lookups, plain-object drag
state, gesture-leak teardown, shallowRef color state, rect caching) and replace
source `any` with proper types.

vue/primitives/src/display/progress/context.ts

@@ -0,0 +1,22 @@
+import type { ComputedRef, Ref } from 'vue';
+import { useContextFactory } from '@robonen/vue';
+
+export type ProgressState = 'indeterminate' | 'loading' | 'complete';
+
+export interface ProgressContext {
+  /** Resolved (validated/clamped) value; `null` when indeterminate. */
+  value: Ref<number | null>;
+  /** Resolved (validated) maximum. */
+  max: Ref<number>;
+  /** Derived progress state. */
+  state: Ref<ProgressState>;
+  /** Completion ratio in `[0, 1]`, or `null` when indeterminate. */
+  progress: ComputedRef<number | null>;
+  /** Completion percentage in `[0, 100]`, or `null` when indeterminate. */
+  percentage: ComputedRef<number | null>;
+}
+
+const ctx = useContextFactory<ProgressContext>('ProgressContext');
+
+export const provideProgressContext = ctx.provide;
+export const useProgressContext = ctx.inject;