feat(vue): TV-style drawing template system in floating style toolbar

[EliteOtaku]

feat(vue): TV-style drawing template system in floating style toolbar

Summary

Adds save/apply drawing templates to the floating style toolbar (the toolbar that appears when a drawing is selected): hosts can inject a template store, saved templates appear as a "模板" dropdown on the toolbar (per drawing kind), and applying one merges the stored style into the selected drawings. Includes a save dialog and a useDrawingTemplates composable with pluggable storage.

Complements the existing DrawingSettingsDialog per-kind template persistence (unchanged) with a quick-apply flow directly on the selection toolbar — matching the TV-style floating-toolbar UX.

Changes

• DrawingStyleToolbar.vue: optional templates prop + applyTemplate/saveTemplate events + a template Dropdown (rendered only when templates exist for the current kind); includes an applyTemplateToSelected-compatible merge path and a save action routed to a new dialog
• DrawingTemplateSaveDialog.vue: name-input dialog for saving the selected drawing's style as a template (busy/error states included)
• useDrawingTemplates.ts: composable owning the template list per kind; storage is pluggable via a DrawingTemplateStore prop (list / load / save / remove), with a built-in localStorage implementation when the host doesn't inject one
• KLineChart.vue: wires the toolbar, dialog and composable together; templates are filtered by the current drawing kind and applied via updateDrawing on each selected drawing

Test plan

• pnpm --filter @363045841yyt/klinechart test — 29 files / 162 tests PASS
• pnpm type-check — 0 errors
• pnpm exec biome check packages/vue — 0 errors
• Manual: select a drawing → save its style as a template → select another drawing of the same kind → apply the template from the toolbar dropdown → style merges; hosts that don't pass templates/drawingTemplateStore see the toolbar unchanged

Notes

• Based on current upstream/main (includes feat(core): future time axis (TV-style free scrolling with trading-calendar extrapolation) #259 future time axis and the drawing magnet toolbar work)
• The upstream DrawingInteractionController already resets the tool before createDrawing (which atomically selects the new drawing), so the "keep newly created drawing selected" behavior this feature expects works out of the box on current main

[363045841]

因为之前其实已经实现了模板系统，因此我们改为在仓库已有的模板基础设施上实现绘图模板系统，因此关闭本 PR：

• 复用既有的按图元类型持久化契约（DrawingTemplateStore），不再另起第二套 localStorage 存储；
• 模板能力同时接入画布浮条与「图元设置」弹窗，两者共享同一份状态；
• 样式应用只写选区共有字段，并走 core 的 updateBatch 样式守卫。

替代实现见 #269。