[IMP] website: fine-tune some snippets headings

[chgo-odoo]

Requires :

• https://github.com/odoo/enterprise/pull/92978
• [IMP] theme_*: improve SEO by correcting heading tag hierarchy design-themes#1043

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Complete list of snippets :
s_attributes_horizontal, s_call_to_action, s_card, s_card_offset, s_card_offset, s_cards_grid, s_cards_soft, s_carousel, s_carousel_cards, s_company_team, s_company_team_basic, s_company_team_detail,
s_company_team_spotlight, s_comparisons, s_cta_card, s_cta_mobile, s_cta_mockups, s_faq_collapse, s_faq_list, s_features, s_features_grid, s_features_wave, s_image_frame, s_image_text_box, s_masonry_block, s_numbers, s_numbers_charts, s_numbers_list, s_showcase, s_table_of_content, s_text_highlight, s_three_columns, s_title

Some snippets in website were using inconsistent heading levels (e.g. h2 directly followed by h6), which harmed both accessibility and SEO. This PR standardizes the heading hierarchy inside snippets to ensure a logical structure.

This improves:

1. Natural SEO ranking by providing clearer semantic signals to search engines.

2. Accessibility for screen readers that rely on a consistent heading order.

3. Overall readability and maintainability of the themes.

Note that the we preserved the design by applying a .h*-fs class that matches the old heading tag in use.

We also fixed selectors inside tests and adapted the new page templates

task-4349019

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[robodoo]

[stefanorigano]

Oops, design-themes is red.
Don't forget to launch runbot tests on that repo when modifying default snippets ;)

[chgo-odoo]

Oops, thanks @stefanorigano 😬

[lebl-odoo]

Just discovered a new tool to list all snippets, it helps a lot, therefore I found new occurrences:

Note : ensure each <section> has at least one title (<hn>)

Opened to the discussion whenever you want

[lebl-odoo]

@chgo-odoo ,

As discussed on Discord, here is a last occurrence to fix:

There is a new snippet, AI that doesn't match our new requirements: h1 is used instead of h2

Good luck for the freeze 💪

[chgo-odoo]

Hello @qsm-odoo 👋

This one is finally ready for review 🙃

Could you please take a look when you have a moment?

Thanks !

[qsm-odoo]

@robodoo r+