adding collapsible table of content

[ghost]

fixes: #88

[Copilot]

Pull request overview

This PR implements a collapsible/nested Table of Contents for blog posts by converting the markdown heading list into a hierarchy and rendering it with a new recursive TOC component.

Changes:

• Update getTableOfContent() to build a nested heading tree instead of returning a flat list.
• Add a new recursive TOC.vue component to render collapsible heading sections and handle smooth scrolling.
• Replace the old flat TOC rendering in ContentSidebar.vue with the new TOC component.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
src/helpers/markdown.js	Builds a hierarchical TOC structure from markdown heading tokens.
src/components/detail/TOC.vue	New recursive, collapsible TOC renderer with scroll-to-heading behavior.
src/components/detail/ContentSidebar.vue	Switches sidebar TOC rendering to use the new TOC component.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

Comments suppressed due to low confidence (1)

src/components/detail/ContentSidebar.vue:30

• toc is validated as a required Array, but it can be null during initial render (the post view initializes toc as ref(null) until the markdown is loaded). This triggers Vue prop validation warnings and is avoidable by providing a default [].

defineProps({
  toc: {
    type: Array,
    required: true
  },

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

[PrajwolAmatya]

The line spacing looks inconsistent. Also on the 5th point of TOC the toogle button is smaller compared to others.

[PrajwolAmatya]

LGTM